simd: SimdProfile fine-grained detection + cpu-* pinning + leaf 7,1 CPUID #429

Job	Run time
format/stable	23s
native-backend/stable	8m 27s
nostd/thumbv6m-none-eabi/stable	28s
clippy/1.95.0	49s
hpc-stream-parallel/rayon	1m 25s
tier4-avx512-check	31s
Pass MSRV values to other jobs	2s
docs/nightly	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
miri	0s
cargo-careful	0s
nightly-simd-polyfill	0s
tests/beta	10m 53s
tests/stable	10m 47s
tests/1.95.0	11m 22s
blas-msrv	48s
conclusion	0s
	45m 55s

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