runtime: eliminate redundant load in Xchg and Xadd on arm64
Loading arguments of Xchg(64) and Xadd(64) functions to registers could be done only once. Change-Id: Iaf0a695ec9c6a221dfa755855edb68c476978a5b Reviewed-on: https://go-review.googlesource.com/c/go/+/227001 Reviewed-by:Keith Randall <khr@golang.org> Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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