Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67602 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Preprocessor/clang_headers.c b/test/Preprocessor/clang_headers.c
index 4fa6153..1cb3319 100644
--- a/test/Preprocessor/clang_headers.c
+++ b/test/Preprocessor/clang_headers.c
@@ -1,3 +1,3 @@
-// RUN: clang -E %s
+// RUN: clang-cc -E %s
 
 #include <limits.h>