Marking debug info intrinsics as not touching memory

caused them to be considered trivially dead.  Fix this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65979 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Utils/Local.cpp b/lib/Transforms/Utils/Local.cpp
index 38809e5e1d7e3110eabc92e4d9e51ee5a49026cb..d2cbec0226e13a5c08ecc47cabbfa0de462f60cf 100644 (file)
--- a/lib/Transforms/Utils/Local.cpp
+++ b/lib/Transforms/Utils/Local.cpp
@@ -159,6 +159,9 @@ bool llvm::ConstantFoldTerminator(BasicBlock *BB) {
 bool llvm::isInstructionTriviallyDead(Instruction *I) {
   if (!I->use_empty() || isa<TerminatorInst>(I)) return false;
 
+  // We don't want debug info removed by anything this general.
+  if (isa<DbgInfoIntrinsic>(I)) return false;
+    
   if (!I->mayWriteToMemory())
     return true;