[BOLT] Add nfc-check-validation step #462
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NFC-mode runs in-tree and out-of-tree (large BOLT tests) when there are changes
affecting llvm-bolt between the current revision and the previous one.
However, the revision SHA itself and the GNU build-id may be two unique
differences when doing such a comparison.
This patch introduces a lightweight sanity check step that reports a warning on
the Buildbot so that we are aware when this occurs.