runtime, internal/cpu, simd/archsimd: add SVE2 detection on linux/arm64 Capture AT_HWCAP2 in archauxv and expose HWCAP2_SVE2 as cpu.ARM64.HasSVE2 and archsimd.ARM64.SVE2(). The upcoming SVE Mul and MulHigh lower to SVE2-only unpredicated encodings, so their tests need the gate. For #79781. Change-Id: I8a8692e100e2ecdcbcaa66a1aa9b55bdf6e89a75 Reviewed-on: https://go-review.googlesource.com/c/go/+/822941 LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com> Auto-Submit: Junyang Shao <shaojunyang@google.com> Reviewed-by: Junyang Shao <shaojunyang@google.com>
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