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/CodeGenCXX/conversion-function.cpp b/clang/test/CodeGenCXX/conversion-function.cpp
index 76d9e02..ec098d0 100644
--- a/clang/test/CodeGenCXX/conversion-function.cpp
+++ b/clang/test/CodeGenCXX/conversion-function.cpp
@@ -1,7 +1,7 @@
 // RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c++11 -S %s -o %t-64.s
-// RUN: FileCheck -check-prefix LP64 --input-file=%t-64.s %s
+// RUN: FileCheck -check-prefix CHECK-LP64 --input-file=%t-64.s %s
 // RUN: %clang_cc1 -triple i386-apple-darwin -std=c++11 -S %s -o %t-32.s
-// RUN: FileCheck -check-prefix LP32 --input-file=%t-32.s %s
+// RUN: FileCheck -check-prefix CHECK-LP32 --input-file=%t-32.s %s
 // XFAIL: *
 extern "C" int printf(...);
 struct S {