[llvm] Revert "[MemCpyOpt] support offset slices for performStackMoveOptzn and processMemCpy" (PR #177217)

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git diff origin/main HEAD -- 'llvm/include/llvm/**/*.h' 'llvm/include/llvm-c/**/*.h' 'llvm/include/llvm/Demangle/**/*.h'
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``````````diff
diff --git a/llvm/include/llvm/Transforms/Scalar/MemCpyOptimizer.h b/llvm/include/llvm/Transforms/Scalar/MemCpyOptimizer.h
index 496d2958f..757029093 100644
--- a/llvm/include/llvm/Transforms/Scalar/MemCpyOptimizer.h
+++ b/llvm/include/llvm/Transforms/Scalar/MemCpyOptimizer.h
@@ -14,6 +14,7 @@
 #ifndef LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H
 #define LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H
 
+#include "llvm/Support/Compiler.h"
 #include "llvm/IR/BasicBlock.h"
 #include "llvm/IR/PassManager.h"
 
@@ -54,10 +55,10 @@ class MemCpyOptPass : public PassInfoMixin<MemCpyOptPass> {
 public:
   MemCpyOptPass() = default;
 
-  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+  LLVM_ABI PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
 
   // Glue for the old PM.
-  bool runImpl(Function &F, TargetLibraryInfo *TLI, AAResults *AA,
+  LLVM_ABI bool runImpl(Function &F, TargetLibraryInfo *TLI, AAResults *AA,
                AssumptionCache *AC, DominatorTree *DT, PostDominatorTree *PDT,
                MemorySSA *MSSA);
 

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https://github.com/llvm/llvm-project/pull/177217