Revert "[InstCombine] fold zext of masked bit set/clear" #1100
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This reverts commit a041c4e.
This looks like a non-trivial change and there has been no code
reviews (at least there were no phabricator revisions attached to the
commit description). It is also causing a regression in one of our
downstream integration tests, we haven't been able to come up with a
minimal reproducer yet.
(cherry picked from commit b212eb7)