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Optimize lsraRegOrder and buildPhysRegRecords to skip non-AVX512 registers if AVX512 not available #81847

@anthonycanino

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@anthonycanino

Per comment #79544 (comment) : we can optimize this section of the code to only use/initialize the AVX512 register records if AVX512 is detected at runtime. See commit 3c7acdb for a rough idea of how to structure these changes.

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area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIavx512Related to the AVX-512 architecture

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