Revert "Reapply [hwasan] Update dbg.assign intrinsics in HWAsan pass … (#79186)

…#78606"

This reverts commit 13c6f1e because it
causes an assertion in DebugInfoMetadata.cpp:1968 in Clang Linux
builders for Fuchsia.

https://logs.chromium.org/logs/fuchsia/buildbucket/cr-buildbucket/8758111613576762817/+/u/clang/build/stdout

Author: gulfemsavrun

llvm/lib/IR/DebugInfo.cpp

@@ -2213,6 +2213,10 @@ bool AssignmentTrackingPass::runOnFunction(Function &F) {
   if (F.hasFnAttribute(Attribute::OptimizeNone))
     return /*Changed*/ false;
 
+  // FIXME: https://github.com/llvm/llvm-project/issues/76545
+  if (F.hasFnAttribute(Attribute::SanitizeHWAddress))
+    return /*Changed*/ false;
+
   bool Changed = false;
   auto *DL = &F.getParent()->getDataLayout();
   // Collect a map of {backing storage : dbg.declares} (currently "backing

llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp

@@ -1435,11 +1435,6 @@ bool HWAddressSanitizer::instrumentStack(memtag::StackInfo &SInfo,
         if (DDI->getVariableLocationOp(LocNo) == AI)
           DDI->setExpression(DIExpression::appendOpsToArg(DDI->getExpression(),
                                                           NewOps, LocNo));
-      if (auto *DAI = dyn_cast<DbgAssignIntrinsic>(DDI)) {
-        if (DAI->getAddress() == AI)
-          DAI->setAddressExpression(DIExpression::prependOpcodes(
-              DAI->getAddressExpression(), NewOps));
-      }
     }
 
     auto TagEnd = [&](Instruction *Node) {

llvm/lib/Transforms/Utils/MemoryTaggingSupport.cpp

@@ -138,20 +138,16 @@ void StackInfoBuilder::visit(Instruction &Inst) {
     return;
   }
   if (auto *DVI = dyn_cast<DbgVariableIntrinsic>(&Inst)) {
-    auto AddIfInteresting = [&](Value *V) {
+    for (Value *V : DVI->location_ops()) {
       if (auto *AI = dyn_cast_or_null<AllocaInst>(V)) {
         if (!isInterestingAlloca(*AI))
-          return;
+          continue;
         AllocaInfo &AInfo = Info.AllocasToInstrument[AI];
         auto &DVIVec = AInfo.DbgVariableIntrinsics;
         if (DVIVec.empty() || DVIVec.back() != DVI)
           DVIVec.push_back(DVI);
       }
-    };
-    for (Value *V : DVI->location_ops())
-      AddIfInteresting(V);
-    if (auto *DAI = dyn_cast<DbgAssignIntrinsic>(DVI))
-      AddIfInteresting(DAI->getAddress());
+    }
   }
   Instruction *ExitUntag = getUntagLocationIfFunctionExit(Inst);
   if (ExitUntag)

llvm/test/CodeGen/AArch64/dbg-assign-tag-offset-mix-loc.ll

@@ -1,6 +1,6 @@
 ; RUN: opt %s -S -passes=declare-to-assign -o - | FileCheck %s
 
-; CHECK: call void @llvm.dbg.assign
+; CHECK: call void @llvm.dbg.declare
 
 define dso_local void @f() sanitize_hwaddress !dbg !9 {
 entry: