[llvm] Fix SIFixSGPRCopies To Handle Physical Registers (PR #149859)

[Janek van Oirschot via llvm-commits]

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+; RUN: llc -mtriple=amdgcn -mcpu=gfx90a -O1 < %s
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JanekvO wrote:

Needs to be piped to `FileCheck` + add checks on expected output (can probably just use update_llc_test_check.py)

I think this test file could use some cleanup (manually or automated through `llvm-reduce`) and a file rename to also add the `swdev` prefix + what's being checked.

https://github.com/llvm/llvm-project/pull/149859