Backport 70fc9703788e8965813c5b677a85cb84b66671b6 to release/18.x

[jayfoad]

This is #79120, a prerequisite of #79325, which is one of very few remaining pieces required to get functional AMDGPU GFX12 support in the 18.x release.

[jayfoad]

/cherry-pick 70fc970

[github-actions]

/branch llvmbot/llvm-project/issue79451

[llvmbot]

@llvm/issue-subscribers-backend-amdgpu

Author: Jay Foad (jayfoad)

This is #79120, a prerequisite of #79325, which is one of very few remaining pieces required to get functional AMDGPU GFX12 support in the 18.x release.

[nikic]

/branch llvmbot/llvm-project/issue79451

[github-actions]

/pull-request #79457

[jayfoad]

@nikic why did you have to repeat the bot's slash-branch comment?

[nikic]

@jayfoad See #79362. The branch command posted by the github-actions bot currently gets ignored.