RegisterCoalescer: Enable terminal rule by default for AMDGPU (#161621) Introduce a target hook to incrementally flip the behavior of targets with test changes, and start by implementing it for AMDGPU. This appears to be forgotten switch flip from 2015. This seems to do a nicer job with subregister copies. Most of the test changes are improvements or neutral, not that many are light regressions. The worst AMDGPU regressions are for true16 in the atomic tests, but I think that's due to existing true16 issues.
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