[objc-arc] Added an option to arc-annotations for turning off CheckForCFGHazard.

llvm-svn: 179717

llvm/lib/Transforms/ObjCARC/ObjCARCOpts.cpp

@@ -710,6 +710,9 @@ void BBState::MergeSucc(const BBState &Other) {
 /// Enable/disable ARC sequence annotations.
 static cl::opt<bool>
 EnableARCAnnotations("enable-objc-arc-annotations", cl::init(false));
+static cl::opt<bool>
+EnableCheckForCFGHazards("enable-objc-arc-checkforcfghazards",
+                         cl::init(true));
 
 /// This function appends a unique ARCAnnotationProvenanceSourceMDKind id to an
 /// instruction so that we can track backwards when post processing via the llvm
@@ -2170,6 +2173,9 @@ ObjCARCOpt::VisitTopDown(BasicBlock *BB,
   // bottom of the basic block.
   ANNOTATE_TOPDOWN_BBEND(MyStates, BB);
 
+#ifdef ARC_ANNOTATIONS
+  if (EnableARCAnnotations && EnableCheckForCFGHazards)
+#endif
   CheckForCFGHazards(BB, BBStates, MyStates);
   return NestingDetected;
 }