[PATCH] D141653: [X86] Improve instruction ordering of constant `srl/shl` with `and` to get better and-masks

[Noah Goldstein via Phabricator via llvm-commits]

goldstein.w.n added a comment.

In D141653#4198903 <https://reviews.llvm.org/D141653#4198903>, @RKSimon wrote:

> @goldstein.w.n What is happening with this patch? After they leave my "Ready to Review" list I tend to lose track......

When I tested on bootstrap build it caused on infinite loop. I think this approach is inherently brittle and susceptible
to that sort of bug. I haven't quite abandoned it as I think some of the shl/shr improvements can be salvaged. But
the `imm` improvedments I want to move to a new pass that runs at the way of end DAG lowering.


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https://reviews.llvm.org/D141653