[PATCH] D150600: [Lanai] Use backwards scavenging in frame index elimination

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

In D150600#4344440 <https://reviews.llvm.org/D150600#4344440>, @jpienaar wrote:

> Would a difference show up on a small test?

If you have a small test that relies on scavenging then we can run it with `-stop-before=prologepilog` to get a MIR test, and then manually add/remove some kill flags to show that forward scavenging is affected by that but backwards scavenging is not.

Currently if I disable the scavenging part of `LanaiRegisterInfo::eliminateFrameIndex` then all the codegen tests still pass :(


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