cmd/internal/obj/arm64: add more atomic instructions
More atomic instructions were introduced in ARMv8.1. And this CL adds support for them and corresponding test cases. LDADD Rs, (Rb), Rt: (Rb) -> Rt, Rs+(Rb) -> (Rb) LDAND Rs, (Rb), Rt: (Rb) -> Rt, Rs&(Rb) -> (Rb) LDEOR Rs, (Rb), Rt: (Rb) -> Rt, Rs^(Rb) -> (Rb) LDOR Rs, (Rb), Rt: (Rb) -> Rt, Rs|(Rb) -> (Rb) Change-Id: Ifb9df86583c4dc54fb96274852c3b93a197045e4 Reviewed-on: https://go-review.googlesource.com/110535Reviewed-by:Cherry Zhang <cherryyz@google.com> Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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