Revert "Fix LLVM_ENABLE_ABI_BREAKING_CHECKS macro check: use #if inst… (#110923)

…ead of #ifdef (#110883)"

This reverts commit 1905cdb, which
causes lots of failures where LLVM doesn't have the right header guards.
The errors can be seen on
[BuildKite](https://buildkite.com/llvm-project/upstream-bazel/builds/112362#01924eae-231c-4d06-ba87-2c538cf40e04),
where the source uses `#ifndef NDEBUG`, but the content in question is
defined when `LLVM_ENABLE_ABI_BREAKING_CHECKS == 1`.

For example, `llvm/include/llvm/Support/GenericDomTreeConstruction.h`
has the following:

```cpp
// Helper struct used during edge insertions.
struct InsertionInfo {
  // ...
#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
  SmallVector<TreeNodePtr, 8> VisitedUnaffected;
#endif
};

// ...

InsertionInfo II;
// ...
#ifndef NDEBUG
            II.VisitedUnaffected.push_back(SuccTN);
#endif
```

Author: cjdb

llvm/include/llvm/CodeGen/SelectionDAG.h

@@ -584,7 +584,7 @@ class SelectionDAG {
     return Root;
   }
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifndef NDEBUG
   void VerifyDAGDivergence();
 #endif
 

llvm/include/llvm/Passes/StandardInstrumentations.h

@@ -171,7 +171,7 @@ class PreservedCFGCheckerInstrumentation {
                     FunctionAnalysisManager::Invalidator &);
   };
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
   SmallVector<StringRef, 8> PassStack;
 #endif
 

llvm/include/llvm/Support/GenericDomTreeConstruction.h

@@ -640,7 +640,7 @@ struct SemiNCAInfo {
         Bucket;
     SmallDenseSet<TreeNodePtr, 8> Visited;
     SmallVector<TreeNodePtr, 8> Affected;
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     SmallVector<TreeNodePtr, 8> VisitedUnaffected;
 #endif
   };
@@ -915,7 +915,7 @@ struct SemiNCAInfo {
     LLVM_DEBUG(dbgs() << "Deleting edge " << BlockNamePrinter(From) << " -> "
                       << BlockNamePrinter(To) << "\n");
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     // Ensure that the edge was in fact deleted from the CFG before informing
     // the DomTree about it.
     // The check is O(N), so run it only in debug configuration.

llvm/include/llvm/Transforms/Scalar/JumpThreading.h

@@ -89,9 +89,9 @@ class JumpThreadingPass : public PassInfoMixin<JumpThreadingPass> {
   bool ChangedSinceLastAnalysisUpdate = false;
   bool HasGuards = false;
 #ifndef LLVM_ENABLE_ABI_BREAKING_CHECKS
-  SmallSet<AssertingVH<const BasicBlock>, 16> LoopHeaders;
-#else
   SmallPtrSet<const BasicBlock *, 16> LoopHeaders;
+#else
+  SmallSet<AssertingVH<const BasicBlock>, 16> LoopHeaders;
 #endif
 
   unsigned BBDupThreshold;

llvm/include/llvm/Transforms/Scalar/LoopPassManager.h

@@ -256,7 +256,7 @@ class LPMUpdater {
   }
 
   void setParentLoop(Loop *L) {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     ParentL = L;
 #endif
   }
@@ -295,7 +295,7 @@ class LPMUpdater {
   /// loops within them will be visited in postorder as usual for the loop pass
   /// manager.
   void addSiblingLoops(ArrayRef<Loop *> NewSibLoops) {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS && !defined(NDEBUG)
+#if defined(LLVM_ENABLE_ABI_BREAKING_CHECKS) && !defined(NDEBUG)
     for (Loop *NewL : NewSibLoops)
       assert(NewL->getParentLoop() == ParentL &&
              "All of the new loops must be siblings of the current loop!");
@@ -347,7 +347,7 @@ class LPMUpdater {
   const bool LoopNestMode;
   bool LoopNestChanged;
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
   // In debug builds we also track the parent loop to implement asserts even in
   // the face of loop deletion.
   Loop *ParentL;

llvm/include/llvm/Transforms/Utils/ScalarEvolutionExpander.h

@@ -168,7 +168,7 @@ class SCEVExpander : public SCEVVisitor<SCEVExpander, Value *> {
   /// consistent when instructions are moved.
   SmallVector<SCEVInsertPointGuard *, 8> InsertPointGuards;
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
   const char *DebugType;
 #endif
 
@@ -184,7 +184,7 @@ class SCEVExpander : public SCEVVisitor<SCEVExpander, Value *> {
         Builder(se.getContext(), InstSimplifyFolder(DL),
                 IRBuilderCallbackInserter(
                     [this](Instruction *I) { rememberInstruction(I); })) {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     DebugType = "";
 #endif
   }
@@ -194,7 +194,7 @@ class SCEVExpander : public SCEVVisitor<SCEVExpander, Value *> {
     assert(InsertPointGuards.empty());
   }
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
   void setDebugType(const char *s) { DebugType = s; }
 #endif
 

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

@@ -11725,7 +11725,7 @@ void SelectionDAG::CreateTopologicalOrder(std::vector<SDNode *> &Order) {
   }
 }
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifndef NDEBUG
 void SelectionDAG::VerifyDAGDivergence() {
   std::vector<SDNode *> TopoOrder;
   CreateTopologicalOrder(TopoOrder);

llvm/lib/Passes/StandardInstrumentations.cpp

@@ -1358,7 +1358,7 @@ void PreservedCFGCheckerInstrumentation::registerCallbacks(
   bool Registered = false;
   PIC.registerBeforeNonSkippedPassCallback([this, &MAM, Registered](
                                                StringRef P, Any IR) mutable {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     assert(&PassStack.emplace_back(P));
 #endif
     (void)this;
@@ -1387,7 +1387,7 @@ void PreservedCFGCheckerInstrumentation::registerCallbacks(
 
   PIC.registerAfterPassInvalidatedCallback(
       [this](StringRef P, const PreservedAnalyses &PassPA) {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
         assert(PassStack.pop_back_val() == P &&
                "Before and After callbacks must correspond");
 #endif
@@ -1396,7 +1396,7 @@ void PreservedCFGCheckerInstrumentation::registerCallbacks(
 
   PIC.registerAfterPassCallback([this, &MAM](StringRef P, Any IR,
                                              const PreservedAnalyses &PassPA) {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     assert(PassStack.pop_back_val() == P &&
            "Before and After callbacks must correspond");
 #endif

llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp

@@ -28,7 +28,7 @@
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Transforms/Utils/LoopUtils.h"
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
 #define SCEV_DEBUG_WITH_TYPE(TYPE, X) DEBUG_WITH_TYPE(TYPE, X)
 #else
 #define SCEV_DEBUG_WITH_TYPE(TYPE, X)

mlir/include/mlir/Analysis/Presburger/PresburgerSpace.h

@@ -75,7 +75,7 @@ class Identifier {
   template <typename T>
   explicit Identifier(T value)
       : value(llvm::PointerLikeTypeTraits<T>::getAsVoidPointer(value)) {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     idType = llvm::getTypeName<T>();
 #endif
   }
@@ -84,7 +84,7 @@ class Identifier {
   /// the type of the identifier used to create it.
   template <typename T>
   T getValue() const {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
     assert(llvm::getTypeName<T>() == idType &&
            "Identifier was initialized with a different type than the one used "
            "to retrieve it.");
@@ -108,7 +108,7 @@ class Identifier {
   /// The value of the identifier.
   void *value = nullptr;
 
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
   /// TypeID of the identifiers in space. This should be used in asserts only.
   llvm::StringRef idType;
 #endif