Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.

llvm-svn: 67602
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index b49813a..a550347 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -332,7 +332,7 @@
   }
       
   const char *Exec = 
-    Args.MakeArgString(getToolChain().GetProgramPath(C, "clang").c_str());
+    Args.MakeArgString(getToolChain().GetProgramPath(C, "clang-cc").c_str());
   Dest.addCommand(new Command(Exec, CmdArgs));
 
   // Claim some arguments which clang doesn't support, but we don't