diff --git a/llvm/include/llvm/Passes/StandardInstrumentations.h b/llvm/include/llvm/Passes/StandardInstrumentations.h
index 84d1b541171bf..9de8ba5b8bf51 100644
--- a/llvm/include/llvm/Passes/StandardInstrumentations.h
+++ b/llvm/include/llvm/Passes/StandardInstrumentations.h
@@ -171,7 +171,7 @@ class PreservedCFGCheckerInstrumentation {
                     FunctionAnalysisManager::Invalidator &);
   };
 
-#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if LLVM_ENABLE_ABI_BREAKING_CHECKS
   SmallVector<StringRef, 8> PassStack;
 #endif
 
diff --git a/llvm/include/llvm/Support/GenericDomTreeConstruction.h b/llvm/include/llvm/Support/GenericDomTreeConstruction.h
index 29b5f9159c68e..b9d398fee2b74 100644
--- a/llvm/include/llvm/Support/GenericDomTreeConstruction.h
+++ b/llvm/include/llvm/Support/GenericDomTreeConstruction.h
@@ -638,7 +638,7 @@ struct SemiNCAInfo {
         Bucket;
     SmallDenseSet<TreeNodePtr, 8> Visited;
     SmallVector<TreeNodePtr, 8> Affected;
-#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if LLVM_ENABLE_ABI_BREAKING_CHECKS
     SmallVector<TreeNodePtr, 8> VisitedUnaffected;
 #endif
   };
@@ -913,7 +913,7 @@ struct SemiNCAInfo {
     LLVM_DEBUG(dbgs() << "Deleting edge " << BlockNamePrinter(From) << " -> "
                       << BlockNamePrinter(To) << "\n");
 
-#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if 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.
diff --git a/llvm/include/llvm/Transforms/Scalar/JumpThreading.h b/llvm/include/llvm/Transforms/Scalar/JumpThreading.h
index 65d43775bdc1d..290e5a1cc337f 100644
--- a/llvm/include/llvm/Transforms/Scalar/JumpThreading.h
+++ b/llvm/include/llvm/Transforms/Scalar/JumpThreading.h
@@ -88,7 +88,7 @@ class JumpThreadingPass : public PassInfoMixin<JumpThreadingPass> {
   std::optional<BranchProbabilityInfo *> BPI;
   bool ChangedSinceLastAnalysisUpdate = false;
   bool HasGuards = false;
-#ifndef LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if !LLVM_ENABLE_ABI_BREAKING_CHECKS
   SmallPtrSet<const BasicBlock *, 16> LoopHeaders;
 #else
   SmallSet<AssertingVH<const BasicBlock>, 16> LoopHeaders;
diff --git a/llvm/include/llvm/Transforms/Scalar/LoopPassManager.h b/llvm/include/llvm/Transforms/Scalar/LoopPassManager.h
index 6aab1f98e6781..227f6dfb8362c 100644
--- a/llvm/include/llvm/Transforms/Scalar/LoopPassManager.h
+++ b/llvm/include/llvm/Transforms/Scalar/LoopPassManager.h
@@ -286,7 +286,7 @@ class LPMUpdater {
   }
 
   void setParentLoop(Loop *L) {
-#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if LLVM_ENABLE_ABI_BREAKING_CHECKS
     ParentL = L;
 #endif
   }
@@ -377,7 +377,7 @@ class LPMUpdater {
   const bool LoopNestMode;
   bool LoopNestChanged;
 
-#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if 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;
diff --git a/llvm/include/llvm/Transforms/Utils/ScalarEvolutionExpander.h b/llvm/include/llvm/Transforms/Utils/ScalarEvolutionExpander.h
index 62c1e15a9a60e..468b50092efcf 100644
--- a/llvm/include/llvm/Transforms/Utils/ScalarEvolutionExpander.h
+++ b/llvm/include/llvm/Transforms/Utils/ScalarEvolutionExpander.h
@@ -167,7 +167,7 @@ class SCEVExpander : public SCEVVisitor<SCEVExpander, Value *> {
   /// consistent when instructions are moved.
   SmallVector<SCEVInsertPointGuard *, 8> InsertPointGuards;
 
-#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if LLVM_ENABLE_ABI_BREAKING_CHECKS
   const char *DebugType;
 #endif
 
@@ -183,7 +183,7 @@ class SCEVExpander : public SCEVVisitor<SCEVExpander, Value *> {
         Builder(se.getContext(), InstSimplifyFolder(DL),
                 IRBuilderCallbackInserter(
                     [this](Instruction *I) { rememberInstruction(I); })) {
-#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if LLVM_ENABLE_ABI_BREAKING_CHECKS
     DebugType = "";
 #endif
   }
@@ -193,7 +193,7 @@ class SCEVExpander : public SCEVVisitor<SCEVExpander, Value *> {
     assert(InsertPointGuards.empty());
   }
 
-#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if LLVM_ENABLE_ABI_BREAKING_CHECKS
   void setDebugType(const char *s) { DebugType = s; }
 #endif
 
diff --git a/llvm/lib/Passes/StandardInstrumentations.cpp b/llvm/lib/Passes/StandardInstrumentations.cpp
index c7adc7668b9a1..b23d5fe245481 100644
--- a/llvm/lib/Passes/StandardInstrumentations.cpp
+++ b/llvm/lib/Passes/StandardInstrumentations.cpp
@@ -1357,7 +1357,7 @@ void PreservedCFGCheckerInstrumentation::registerCallbacks(
   bool Registered = false;
   PIC.registerBeforeNonSkippedPassCallback([this, &MAM, Registered](
                                                StringRef P, Any IR) mutable {
-#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if LLVM_ENABLE_ABI_BREAKING_CHECKS
     assert(&PassStack.emplace_back(P));
 #endif
     (void)this;
@@ -1386,7 +1386,7 @@ void PreservedCFGCheckerInstrumentation::registerCallbacks(
 
   PIC.registerAfterPassInvalidatedCallback(
       [this](StringRef P, const PreservedAnalyses &PassPA) {
-#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if LLVM_ENABLE_ABI_BREAKING_CHECKS
         assert(PassStack.pop_back_val() == P &&
                "Before and After callbacks must correspond");
 #endif
@@ -1395,7 +1395,7 @@ void PreservedCFGCheckerInstrumentation::registerCallbacks(
 
   PIC.registerAfterPassCallback([this, &MAM](StringRef P, Any IR,
                                              const PreservedAnalyses &PassPA) {
-#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if LLVM_ENABLE_ABI_BREAKING_CHECKS
     assert(PassStack.pop_back_val() == P &&
            "Before and After callbacks must correspond");
 #endif
diff --git a/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp b/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
index 0feea0a4233cd..b79594fae00e6 100644
--- a/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
+++ b/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
@@ -28,7 +28,7 @@
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Transforms/Utils/LoopUtils.h"
 
-#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if 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)