Sanjay Patel 4ecc6af813 [InstCombine] create a pass options container and add "use-loop-info" argument ...

This is a cleanup/modernization patch requested in D144045 to make loop
analysis a proper optional parameter to the pass rather than a
semi-arbitrary value inherited via the pass pipeline.

It's a bit more complicated than the recent patch I started copying from
(D143980) because InstCombine already has an option for MaxIterations
(added with D71145).

I debated just deleting that option, but it was used by a pair of existing
tests, so I put it into a struct (code largely copied from SimplifyCFG's
implementation) to make the code more flexible for future options
enhancements.

I didn't alter the pass manager invocations of InstCombine in this patch
because the patch was already getting big, but that will be a small
follow-up as noted with the TODO comment.

Differential Revision: https://reviews.llvm.org/D144199

2023-02-17 10:30:15 -05:00

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