arm64/arm64gen: support current system register XML Update arm64gen for the current Arm A-profile system register XML. Ignore unrelated archive entries, handle parameterized encodings that use m or n bit slices, honor nonzero register minima, and locate the MRS/MSR access mechanism instead of requiring it to appear first. This allows the Go assembler system register table to be regenerated with newer register definitions. The generated Go assembler table update is CL 808441. Change-Id: I9e23863c589369444733d06a2e9b005283e1eb16 Reviewed-on: https://go-review.googlesource.com/c/arch/+/808361 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Carlos Amedee <carlos@golang.org> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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