runtime/internal/atomic: don't use Cas in atomic.Load on ARM
Instead issue a memory barrier on ARMv7 after reading the address. Fixes #23777 Change-Id: I7aff2ab0246af64b437ebe0b31d4b30d351890d8 Reviewed-on: https://go-review.googlesource.com/94275Reviewed-by:Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by:
Cherry Zhang <cherryyz@google.com> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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