Update tests to use %clang_cc1 instead of 'clang-cc' or 'clang -cc1'.
 - This is designed to make it obvious that %clang_cc1 is a "test variable"
   which is substituted. It is '%clang_cc1' instead of '%clang -cc1' because it
   can be useful to redefine what gets run as 'clang -cc1' (for example, to set
   a default target).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91446 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/private-extern.c b/test/Sema/private-extern.c
index 5dd37f4..d3c1265 100644
--- a/test/Sema/private-extern.c
+++ b/test/Sema/private-extern.c
@@ -1,4 +1,4 @@
-// RUN: clang-cc -verify -fsyntax-only %s
+// RUN: %clang_cc1 -verify -fsyntax-only %s
 
 static int g0; // expected-note{{previous definition}}
 int g0; // expected-error{{non-static declaration of 'g0' follows static declaration}}