ccc: -x assembler-with-cpp was broken for darwin, and it wasn't using
clang as the preprocessor even when it should.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66737 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/ccc/ccclib/ToolChain.py b/tools/ccc/ccclib/ToolChain.py
index 8c71789..d081f28 100644
--- a/tools/ccc/ccclib/ToolChain.py
+++ b/tools/ccc/ccclib/ToolChain.py
@@ -57,14 +57,14 @@
 
     def shouldUseClangCompiler(self, action):
         # If user requested no clang, or this isn't a "compile" phase,
-        # or this isn't a C family option, then don't use clang.
+        # or this isn't an input clang understands, then don't use clang.
         if (self.driver.cccNoClang or 
             not isinstance(action.phase, (Phases.PreprocessPhase,
                                           Phases.CompilePhase,
                                           Phases.SyntaxOnlyPhase,
                                           Phases.EmitLLVMPhase,
                                           Phases.PrecompilePhase)) or
-            action.inputs[0].type not in Types.cTypesSet):
+            action.inputs[0].type not in Types.clangableTypesSet):
             return False
 
         if self.driver.cccNoClangPreprocessor: