Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.

llvm-svn: 67602
diff --git a/clang/test/Parser/attributes.c b/clang/test/Parser/attributes.c
index d7fc35d..37fa0ca 100644
--- a/clang/test/Parser/attributes.c
+++ b/clang/test/Parser/attributes.c
@@ -1,4 +1,4 @@
-// RUN: clang -fsyntax-only -verify %s -pedantic -std=c99
+// RUN: clang-cc -fsyntax-only -verify %s -pedantic -std=c99
 
 int __attribute__(()) x;  // expected-warning {{extension used}}