Add runtime detection for new AMX variants and MOVRS #1763
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sayantn force-pushed the new-amx-movrs branch 2 times, most recently from 1a7ca47 to c8f533c Compare 
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See rust-lang/rust#138003 and rust-lang/rust#137976
Updates SDE to v9.53.0
For some reason
intel-sde/misc/cpuid/future/cpuid.defhas not been updated, so I am temporarily usingintel-sde/misc/cpuid/dmr/cpuid.defwith some edits.TODO: When Intel fixes their
intel-sde/misc/cpuid/future/cpuid.def, revert to using thatFixes: In cpus which have amx, but not avx512, amx didn't show up in
is_x86_feature_detected!Also removed the
without cfg checkclause from a few riscv target features because they got merged in the compiler