Fix unused variable warnings in release builds. (swiftlang#18755)

Author: airspeedswift

include/swift/SILOptimizer/Analysis/PassManagerVerifierAnalysis.h

@@ -25,6 +25,7 @@ namespace swift {
 /// All methods are no-ops when asserts are disabled.
 class PassManagerVerifierAnalysis : public SILAnalysis {
   /// The module that we are processing.
+  LLVM_ATTRIBUTE_UNUSED
   SILModule &mod;
 
   /// The set of "live" functions that we are tracking.

lib/AST/NameLookup.cpp

@@ -2112,6 +2112,7 @@ bool DeclContext::lookupAnyObject(DeclName member, NLOptions options,
     auto dc = decl->getDeclContext();
     auto nominal = dc->getAsNominalTypeOrNominalTypeExtensionContext();
     assert(nominal && "Couldn't find nominal type?");
+    (void)nominal;
 
     // If we didn't see this declaration before, and it's an acceptable
     // result, add it to the list.

lib/FrontendTool/FrontendTool.cpp

@@ -283,6 +283,7 @@ static bool emitSyntax(SourceFile *SF, LangOptions &LangOpts,
   auto bufferID = SF->getBufferID();
   assert(bufferID && "frontend should have a buffer ID "
          "for the main source file");
+  (void)bufferID;
 
   auto os = getFileOutputStream(OutputFilename, SF->getASTContext());
   if (!os) return true;

lib/IDE/CodeCompletionCache.cpp

@@ -137,6 +137,7 @@ static bool readCachedModule(llvm::MemoryBuffer *in,
     auto result = llvm::support::endian::read32le(cursor);
     cursor += sizeof(result);
     assert(cursor <= end);
+    (void)end;
     return result;
   };
 

lib/IRGen/TypeLayoutDumper.cpp

@@ -192,6 +192,7 @@ bool swift::performDumpTypeInfo(IRGenOptions &Opts,
                                 llvm::LLVMContext &LLVMContext) {
   auto &Ctx = SILMod.getASTContext();
   assert(!Ctx.hadError());
+  (void)Ctx;
 
   IRGenerator IRGen(Opts, SILMod);
   IRGenModule IGM(IRGen, IRGen.createTargetMachine(), LLVMContext);

lib/SILOptimizer/Transforms/AccessEnforcementOpts.cpp

@@ -730,6 +730,8 @@ void AccessConflictAndMergeAnalysis::mergePredAccesses(
     assert((predRegion->getParentID() == bbRegionParentID) &&
            "predecessor is not part of the parent region - unhandled control "
            "flow");
+    (void)predRegion;
+    (void)bbRegionParentID;
     if (localRegionInfos.find(pred) == localRegionInfos.end()) {
       // Backedge / irreducable control flow - bail
       info.reset();

lib/Sema/CSRanking.cpp

@@ -559,6 +559,7 @@ static bool isDeclAsSpecializedAs(TypeChecker &tc, DeclContext *dc,
           computeSelfTypeRelationship(tc, dc, decl1, decl2);
       auto relationshipKind = selfTypeRelationship.first;
       auto conformance = selfTypeRelationship.second;
+      (void)conformance;
       switch (relationshipKind) {
       case SelfTypeRelationship::Unrelated:
         // Skip the self types parameter entirely.

lib/Sema/DerivedConformanceRawRepresentable.cpp

@@ -317,6 +317,7 @@ deriveRawRepresentable_init(DerivedConformance &derived) {
   assert(equatableProto);
   assert(tc.conformsToProtocol(rawType, equatableProto, enumDecl, None));
   (void)equatableProto;
+  (void)rawType;
 
   auto *selfDecl = ParamDecl::createSelf(SourceLoc(), parentDC,
                                          /*static*/false, /*inout*/true);