At -O0, prefer objc_storeStrong with a null new value to the
combination of a load+objc_release;  this is generally better
for tools that try to track why values are retained and
released.  Also use objc_storeStrong when copying a block
(again, only at -O0), which requires us to do a preliminary
store of null in order to compensate for objc_storeStrong's
assign semantics.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@166085 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenFunction.h b/lib/CodeGen/CodeGenFunction.h
index 65fa87f5..34fc8b9 100644
--- a/lib/CodeGen/CodeGenFunction.h
+++ b/lib/CodeGen/CodeGenFunction.h
@@ -2353,6 +2353,7 @@
   llvm::Value *EmitARCRetain(QualType type, llvm::Value *value);
   llvm::Value *EmitARCRetainNonBlock(llvm::Value *value);
   llvm::Value *EmitARCRetainBlock(llvm::Value *value, bool mandatory);
+  void EmitARCDestroyStrong(llvm::Value *addr, bool precise);
   void EmitARCRelease(llvm::Value *value, bool precise);
   llvm::Value *EmitARCAutorelease(llvm::Value *value);
   llvm::Value *EmitARCAutoreleaseReturnValue(llvm::Value *value);