[CodeGen] Avoid use of ConstantExpr::getZExt() (NFC)

Use the constant folding API instead. In preparation for dropping
zext constant expressions.

1 files changed, 5 insertions, 1 deletions

diff --git a/clang/lib/CodeGen/CGExprConstant.cpp b/clang/lib/CodeGen/CGExprConstant.cpp
index 2c847f0bb13f..9b67a8b3335a 100644
--- a/clang/lib/CodeGen/CGExprConstant.cpp
+++ b/clang/lib/CodeGen/CGExprConstant.cpp
@@ -25,6 +25,7 @@
 #include "clang/Basic/Builtins.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/Sequence.h"
+#include "llvm/Analysis/ConstantFolding.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/Function.h"
@@ -1761,7 +1762,10 @@ llvm::Constant *ConstantEmitter::emitForMemory(CodeGenModule &CGM,
   // Zero-extend bool.
   if (C->getType()->isIntegerTy(1) && !destType->isBitIntType()) {
     llvm::Type *boolTy = CGM.getTypes().ConvertTypeForMem(destType);
-    return llvm::ConstantExpr::getZExt(C, boolTy);
+    llvm::Constant *Res = llvm::ConstantFoldCastOperand(
+        llvm::Instruction::ZExt, C, boolTy, CGM.getDataLayout());
+    assert(Res && "Constant folding must succeed");
+    return Res;
   }
 
   return C;