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/macro_expand.c b/test/Preprocessor/macro_expand.c
index 69a4835..a7a80af 100644
--- a/test/Preprocessor/macro_expand.c
+++ b/test/Preprocessor/macro_expand.c
@@ -1,4 +1,4 @@
-// RUN: clang -E %s | grep '^Y$'
+// RUN: clang-cc -E %s | grep '^Y$'
 
 #define X() Y
 #define Y() X