Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.

llvm-svn: 67602
diff --git a/clang/test/Sema/transparent-union-pointer.c b/clang/test/Sema/transparent-union-pointer.c
index 58597b1..ea761f1 100644
--- a/clang/test/Sema/transparent-union-pointer.c
+++ b/clang/test/Sema/transparent-union-pointer.c
@@ -1,4 +1,4 @@
-// RUN: clang %s -fsyntax-only -verify
+// RUN: clang-cc %s -fsyntax-only -verify
 
 typedef union   {
 	union wait *__uptr;