ValueMapper: fix typo in minor optimization on constant mapping (NFC)

If every operands of a constant are mapping to themselves, and the
type does not change, we have an early exit as acknowledged in the
comment:

  // Otherwise, we have some other constant to remap.  Start by checking to see
  // if all operands have an identity remapping.

However instead of checking for identity the code was checking if the
operands were mapped to the constant itself, which is rarely true.

As a consequence, the coverage report showed that the early exit was
never taken.

llvm-svn: 270944

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Utils/ValueMapper.cpp b/llvm/lib/Transforms/Utils/ValueMapper.cpp
index 0e6b6c5ead5..5a48a204973 100644
--- a/llvm/lib/Transforms/Utils/ValueMapper.cpp
+++ b/llvm/lib/Transforms/Utils/ValueMapper.cpp
@@ -436,7 +436,8 @@ Value *Mapper::mapValue(const Value *V) {
   for (; OpNo != NumOperands; ++OpNo) {
     Value *Op = C->getOperand(OpNo);
     Mapped = mapValue(Op);
-    if (Mapped != C) break;
+    if (Mapped != Op)
+      break;
   }
 
   // See if the type mapper wants to remap the type as well.