x86/x86asm: make x86asm.Decode thread-safe
Moves initialization of the decoderCover variable from happening
unconditionally to only being initialized by the test code using it so
that it does not cause a data race when not being used and Decode is
called in parallel.
Fixes golang/go#33532
Change-Id: I64d748f94d135f0c1f55f1456ff770ac5205c85a
GitHub-Last-Rev: 679e78ed1daf3ddbd03792155e3be90b7b498fc4
GitHub-Pull-Request: golang/arch#4
Reviewed-on: https://go-review.googlesource.com/c/arch/+/189919
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2 files changed
