[llvm] [AMDGPU] Implement workaround for GFX11.5 export priority (PR #99273)

[Matt Arsenault via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
+# RUN: llc -mtriple=amdgcn -mcpu=gfx1150 -mattr=-wavefrontsize32,+wavefrontsize64 -run-pass=post-RA-hazard-rec -verify-machineinstrs  %s -o - | FileCheck -check-prefixes=GFX1150 %s
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arsenm wrote:

Don't need -wavefrontsize32 or -verify-machineinstrs. Also test the generic target?

https://github.com/llvm/llvm-project/pull/99273