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arm64: Select REG_ORDER candidates with ordered masks - #136836
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- Related to dotnet#136694 Use register-mask groups in ARM64 register allocation to preserve the existing register preference order without scanning every candidate's rank. Keep the original scan on other targets and cross-check choices in Checked builds. Against main (b4548da), Release JITs executed 3,999,913,819,224 instructions versus 4,017,017,735,574 on main across seven published Linux ARM64 SuperPMI collections, a 0.426% reduction. SuperPMI asm diffs found no generated code differences among replayed contexts.
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Use register-mask groups in ARM64 register allocation to preserve the existing register preference order without scanning every candidate's rank. Keep the original scan on other targets and cross-check choices in Checked builds.
Against main (b4548da), Release JITs executed 3,999,913,819,224 instructions versus 4,017,017,735,574 on main across seven published Linux ARM64 SuperPMI collections, a 0.426% reduction. SuperPMI asm diffs found no generated code differences among replayed contexts.