Mark Danial 4018d25da8 LoopNest Analysis expansion to return instructions that prevent a Loop
Nest from being perfect

Expand LoopNestAnalysis to return the full list of instructions that
cause a loop nest to be imperfect. This is useful for other passes to
know if they should continue for in the inner loops.
Added New function getInterveningInstructions
that returns a small vector with the instructions that prevent a loop
for being perfect. Also added a couple of helper functions to reduce
code duplication.

Reviewed By: Whitney

Differential Revision: https://reviews.llvm.org/D107773
2021-08-17 22:25:49 +00:00
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