AMX int8/bf16 tile GEMM — enable, fix 5 bugs, optimize (0→197 GMAC/s) + vertical-SIMD primitives #548

Job	Run time
Pass MSRV values to other jobs	4s
hpc-stream-parallel/rayon	1m 22s
native-backend/stable	8m 11s
format/stable	18s
clippy/1.95.0	48s
nostd/thumbv6m-none-eabi/stable	26s
tier4-avx512-check	31s
nightly-simd-polyfill	0s
cargo-careful	0s
docs/nightly	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
miri	0s
blas-msrv	51s
tests/beta	11m 5s
tests/stable	10m 38s
tests/1.95.0	10m 55s
conclusion	0s
	45m 9s

Provide feedback