Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.

llvm-svn: 67602
diff --git a/clang/test/CodeGen/cfstring.c b/clang/test/CodeGen/cfstring.c
index 3bd1a2d..a78dfda 100644
--- a/clang/test/CodeGen/cfstring.c
+++ b/clang/test/CodeGen/cfstring.c
@@ -1,4 +1,4 @@
-// RUN: clang -emit-llvm %s -o %t
+// RUN: clang-cc -emit-llvm %s -o %t
 #define CFSTR __builtin___CFStringMakeConstantString
 
 void f() {