[llvm] [AMDGCN] Allow unscheduling of bundled insns (PR #129769)

[Matt Arsenault via llvm-commits]

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+; RUN: llc -mtriple=amdgcn -mcpu=gfx90a -verify-machineinstrs -O1 -stop-after=machine-scheduler < %s | FileCheck -check-prefix=DEBUG %s
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arsenm wrote:

This MIR test is too big, and looks like the raw -stop-before output. You should reduce it, or synthetically construct a tiny example. You can drop the registers and IR section. You can try llvm-reduce on the mir, although that will take some additional cleanups after 

https://github.com/llvm/llvm-project/pull/129769