Fix an oversight: don't run ARC optimization cleanup at -O0.

llvm-svn: 154052

Author: Dan Gohman

clang/lib/CodeGen/BackendUtil.cpp

@@ -382,7 +382,8 @@ bool EmitAssemblyHelper::AddEmitPasses(BackendAction Action,
   // Add ObjC ARC final-cleanup optimizations. This is done as part of the
   // "codegen" passes so that it isn't run multiple times when there is
   // inlining happening.
-  if (LangOpts.ObjCAutoRefCount)
+  if (LangOpts.ObjCAutoRefCount &&
+      CodeGenOpts.OptimizationLevel > 0)
     PM->add(createObjCARCContractPass());
 
   if (TM->addPassesToEmitFile(*PM, OS, CGFT,