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

[Ben Langmuir]

Add a CC1 option ‘-verify-pch’ that will load the given pch file and verify it as if it were being passed in -include-pch

The rationale for this option was discussed here: http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-November/033486.html

If this patch is okay, then I also intend to change the ASTReader to stat system header input files when using -verify-pch (but keep the current behavior otherwise).

Ben

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