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/_Pragma-syshdr.c b/test/Preprocessor/_Pragma-syshdr.c
index 4d2d29e..44eda5f 100644
--- a/test/Preprocessor/_Pragma-syshdr.c
+++ b/test/Preprocessor/_Pragma-syshdr.c
@@ -1,4 +1,4 @@
-// RUN: clang %s -E 2>&1 | grep 'system_header ignored in main file'
+// RUN: clang-cc %s -E 2>&1 | grep 'system_header ignored in main file'
 
 _Pragma ("GCC system_header")