[PATCH] bugpoint: Verify input files

[Duncan P. N. Exon Smith]

Like r233229 for `llvm-link`, start verifying input files to `bugpoint`.

I was about to commit this -- it makes updating bugpoint testcases *much*
easier (something I've been doing a fair bit of, as I coerce the debug
info verification towards usefulness) and catches weird crashes up-front
-- but then I wondered if we should have a -no-verify (or similar) flag?

`bugpoint` isn't supposed to work with sort-of-broken code, is it?

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