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

clang/test/CodeCompletion/operator.cpp

@@ -8,7 +8,7 @@ void f() {
   typedef float Float;
   
   operator
-  // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:10:11 %s -o - | FileCheck -check-prefix=CC1 %s
+  // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:10:11 %s -o - | FileCheck -check-prefix=CHECK-CC1 %s
   // CHECK-CC1: +
   // CHECK-CC1: Float
   // CHECK-CC1: Integer