Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.

llvm-svn: 67602
diff --git a/clang/test/Sema/knr-def-call.c b/clang/test/Sema/knr-def-call.c
index 83a0c5e..0e562d7 100644
--- a/clang/test/Sema/knr-def-call.c
+++ b/clang/test/Sema/knr-def-call.c
@@ -1,4 +1,4 @@
-// RUN: clang -fsyntax-only -verify %s
+// RUN: clang-cc -fsyntax-only -verify %s
 
 // C DR #316, PR 3626.
 void f0(a, b, c, d) int a,b,c,d; {}