Fix CodeGenPrepare::stripInvariantGroupMetadata

`dropUnknownNonDebugMetadata` takes a list of "known" metadata IDs.  The
only reason it worked at all is that `getMetadataID` returns something
unrelated -- it returns the subclass ID of the receiver (which is used
in `dyn_cast` etc.).  That does not numerically match
`LLVMContext::MD_invariant_group` and ends up dropping `invariant_group`
along with every other metadata that does not numerically match
`LLVMContext::MD_invariant_group`.

llvm-svn: 289973

1 files changed, 1 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 0ae57ce0c36..bc333b95ee0 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -5735,6 +5735,5 @@ bool CodeGenPrepare::splitBranchCondition(Function &F) {
 }
 
 void CodeGenPrepare::stripInvariantGroupMetadata(Instruction &I) {
-  if (auto *InvariantMD = I.getMetadata(LLVMContext::MD_invariant_group))
-    I.dropUnknownNonDebugMetadata(InvariantMD->getMetadataID());
+  I.setMetadata(LLVMContext::MD_invariant_group, nullptr);
 }