[llvm] Add support for x87 registers on GISel register selection (PR #83528)

[via llvm-commits]

MalaySanghiIntel wrote:

> Does GISel have support for the stackifier?

When you say stackifier, do you mean the post-RA pass or something else? I don't recall anything seeing anything specific to stackifier in the DAG passes. Maybe I missed something. Can you please explain if I missed it?

https://github.com/llvm/llvm-project/pull/83528