[cfe-commits] plug a memory leak in the -E code

[Sam Bishop]

When clang is acting on the -E option, it creates a
PrintPPOutputPPCallbacks object but never deletes it.  The object is
passed to the Preprocessor object, but it doesn't delete it either.

It seems to me that the Driver code ought to do the deleting.  So I have
attached a patch which does just that.

Thanks,
Sam Bishop
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