Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.

llvm-svn: 67602
diff --git a/clang/test/Sema/arg-scope.c b/clang/test/Sema/arg-scope.c
index fc2bb70..c1cc7e1 100644
--- a/clang/test/Sema/arg-scope.c
+++ b/clang/test/Sema/arg-scope.c
@@ -1,4 +1,4 @@
-// RUN: clang -fsyntax-only -verify %s
+// RUN: clang-cc -fsyntax-only -verify %s
 int aa(int b, int x[sizeof b]) {}
 
 void foo(int i, int A[i]) {}