[llvm] [TableGen][GISel] Learn to import patterns with physreg defs (PR #120343)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

@arsenm Could you take a look at the failing test?
The change allows importing `S_CMP_*` patterns, and there is one test where this causes machine verifier errors on vgrp->sgrp copy (the argument of S_CMP*). IIUC this should be fixed by SIFixSGPRCopies, but adding this pass to `GCNPassConfig::addGlobalInstructionSelect` didn't help.


https://github.com/llvm/llvm-project/pull/120343