cmd/compile: include SVE predicate registers in arm64 callerSave The arm64 callerSave set omitted the sixteen P registers, so the register allocator believed calls preserve them and could keep a live mask in a P register across a call that clobbers it. amd64 includes its K mask registers in callerSave; do the same for pred. For #79781. Change-Id: I5c64e751f0d10a66615208beff9f13858cd0730a Reviewed-on: https://go-review.googlesource.com/c/go/+/827485 Reviewed-by: Junyang Shao <shaojunyang@google.com> Reviewed-by: David Chase <drchase@google.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: Junyang Shao <shaojunyang@google.com>
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