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/stringize_space2.c b/test/Preprocessor/stringize_space2.c
index cf81674..6a96894 100644
--- a/test/Preprocessor/stringize_space2.c
+++ b/test/Preprocessor/stringize_space2.c
@@ -1,4 +1,4 @@
-/* RUN: clang -E %s | grep 'a c'
+/* RUN: clang-cc -E %s | grep 'a c'
  */
 #define t(x) #x
 t(a