Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.

llvm-svn: 67602
diff --git a/clang/test/Lexer/digraph.c b/clang/test/Lexer/digraph.c
index 9683ee4..4d494ca 100644
--- a/clang/test/Lexer/digraph.c
+++ b/clang/test/Lexer/digraph.c
@@ -1,4 +1,4 @@
-// RUN: clang -fsyntax-only -verify < %s
+// RUN: clang-cc -fsyntax-only -verify < %s
 
 %:include <stdio.h>