[AArch64] Quantized MatMul performance improvement #2536
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- implement Neon i8mm based matmul
- using i8mm intrinsics requires a nightly compiler,
so the change is added under the feature flag 'arm-nightly-feat'
- also added vdotq under the same feature flag
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This change implements an new matmul based on Armv8.6 i8mm instructions. As the change requires a nightly compiler, using the more performant version is optional, under the new
arm-nightly-featfeature flag.I have also added the Armv8.4 dotprod instructions under this flag.
Performance improvement: