Jeffrey Byrnes cf1c97b2d2 [AMDGPU] Do not attempt to fallback to default mutations (#83208) ...

IGLP itself will be in SavedMutations via mutations added during
Scheduler creation, thus falling back results in reapplying IGLP.

In PostRA scheduling, if we have multiple regions with IGLP
instructions, then we may have infinite loop.

Disable the feature for now.

2024-02-27 18:04:59 -08:00

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