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[NFC][InstCombine] Add tests for PHI merging/aggregate reconstruction (PR47060)

Authored by lebedev.ri on Aug 11 2020, 12:40 PM.

Description

[NFC][InstCombine] Add tests for PHI merging/aggregate reconstruction (PR47060)

We should be able to see that the new aggregate we have produced
is identical to the source aggregate from which we've extracted
the elements that we used to form a new aggregate.

This happens (a lot) in clang C++ exception code on unwind branch.

Details

Committed
lebedev.riAug 11 2020, 12:40 PM
Parents
rG9b211a507631: [libunwind] Fix incorrect check for out-of-boundedness
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