Fix FileCheck --check-prefix lines.

Various tests had sprung up over the years which had --check-prefix=ABC on the
RUN line, but "CHECK-ABC:" later on. This happened to work before, but was
strictly incorrect. FileCheck is getting stricter soon though.

Patch by Ron Ofir.

llvm-svn: 188174
diff --git a/clang/test/CodeGenObjC/local-static-block.m b/clang/test/CodeGenObjC/local-static-block.m
index deea8ba..b5b4534 100644
--- a/clang/test/CodeGenObjC/local-static-block.m
+++ b/clang/test/CodeGenObjC/local-static-block.m
@@ -1,5 +1,5 @@
 // RUN: %clang_cc1 -fblocks -triple x86_64-apple-darwin -fobjc-runtime=macosx-fragile-10.5 -emit-llvm %s -o %t-64.ll
-// RUN: FileCheck -check-prefix LP64 --input-file=%t-64.ll %s
+// RUN: FileCheck -check-prefix CHECK-LP64 --input-file=%t-64.ll %s
 // rdar: // 8390455
 
 @class NSArray;