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/Modules/driver.c b/clang/test/Modules/driver.c
index 08fdaab..79d1bbe 100644
--- a/clang/test/Modules/driver.c
+++ b/clang/test/Modules/driver.c
@@ -1,5 +1,5 @@
-// RUN: %clang -fmodules %s -### 2>&1 | FileCheck -check-prefix NO_MODULE_CACHE %s
-// RUN: %clang -fmodules -fmodules-cache-path=blarg %s -### 2>&1 | FileCheck -check-prefix WITH_MODULE_CACHE %s
+// RUN: %clang -fmodules %s -### 2>&1 | FileCheck -check-prefix CHECK-NO_MODULE_CACHE %s
+// RUN: %clang -fmodules -fmodules-cache-path=blarg %s -### 2>&1 | FileCheck -check-prefix CHECK-WITH_MODULE_CACHE %s
 
 // CHECK-NO_MODULE_CACHE: {{clang.*"-fmodules-cache-path=.*ModuleCache"}}