[arcmt] Use CFBridgingRetain/CFBridgingRelease instead of __bridge_retained/__bridge_transfer
when migrating.

rdar://11569198

llvm-svn: 157785
diff --git a/clang/lib/Sema/SemaExprObjC.cpp b/clang/lib/Sema/SemaExprObjC.cpp
index c1f7aae..5ee3c7b 100644
--- a/clang/lib/Sema/SemaExprObjC.cpp
+++ b/clang/lib/Sema/SemaExprObjC.cpp
@@ -2771,11 +2771,12 @@
   };
 }
 
-static bool
-KnownName(Sema &S, const char *name) {
-  LookupResult R(S, &S.Context.Idents.get(name), SourceLocation(),
+bool Sema::isKnownName(StringRef name) {
+  if (name.empty())
+    return false;
+  LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
                  Sema::LookupOrdinaryName);
-  return S.LookupName(R, S.TUScope, false);
+  return LookupName(R, TUScope, false);
 }
 
 static void addFixitForObjCARCConversion(Sema &S,
@@ -2884,7 +2885,7 @@
       << castType
       << castRange
       << castExpr->getSourceRange();
-    bool br = KnownName(S, "CFBridgingRelease");
+    bool br = S.isKnownName("CFBridgingRelease");
     {
       DiagnosticBuilder DiagB = S.Diag(noteLoc, diag::note_arc_bridge);
       addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
@@ -2903,7 +2904,7 @@
     
   // Bridge from a CF type to an ARC type.
   if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
-    bool br = KnownName(S, "CFBridgingRetain");
+    bool br = S.isKnownName("CFBridgingRetain");
     S.Diag(loc, diag::err_arc_cast_requires_bridge)
       << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
       << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
@@ -3156,7 +3157,7 @@
       break;
       
     case OBC_BridgeRetained: {
-      bool br = KnownName(*this, "CFBridgingRelease");
+      bool br = isKnownName("CFBridgingRelease");
       Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
         << 2
         << FromType
@@ -3199,7 +3200,7 @@
       break;
       
     case OBC_BridgeTransfer: {
-      bool br = KnownName(*this, "CFBridgingRetain");
+      bool br = isKnownName("CFBridgingRetain");
       Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
         << (FromType->isBlockPointerType()? 1 : 0)
         << FromType