[PATCH] Add a -verify-pch option to clang -cc1

[Ben Langmuir]

> Looks good!
> Could you also add a driver option (maybe "--verify-pch") ?

Sure, I’ve added -verify-pch to the driver as well.  I kept the same spelling between the two options.  The biggest change here is that we don’t want the driver to pass through -x TYPE to cc1 for an input file that is a pch when we are verifying, since we want to verify the *source* language.  Right now I am omitting "-x TYPE" when -verify-pch is set AND the input file has a .pch extension.  I’m not sure whether checking the extension is a good idea, but it is consistent with other bits of the compiler that will assume the input is an object file if it has no extension and no explicit -x option.  I’m happy to change it.

Ben

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