[llvm] [GlobalISel] Remove LegacyLegalizerInfo (PR #197308)

[Evgenii Kudriashov via llvm-commits]

e-kud wrote:

> Hi - thanks for checking. It sounds like some other node doesn't have a action builder, but isn't testing in any of the tests. Maybe one of the ones from https://github.com/llvm/llvm-project/pull/197238/changes?

Yes, you are completely right! `G_INVOKE_REGION_START` is the one causing the regression. Once added `.alwaysLegal`, everything returned back.

https://github.com/llvm/llvm-project/pull/197308