riscv64: improve disassembler support for FENCE This commit adds disassembler support for FENCE.TSO in both gnu and plan9 disassembly. It also adds support for FENCE operands in plan9 disassembly. These were previously supported for gnu syntax disassembly but not for plan9 disassembly. We also add a few more checks to ensure that reserved FENCE encodings are decoded as full fences, rather than say FENCE ,. Change-Id: I89fb8cef3fc57a2dcd282bd9c4c27d63f47eaea0 Reviewed-on: https://go-review.googlesource.com/c/arch/+/762800 Reviewed-by: Carlos Amedee <carlos@golang.org> Reviewed-by: Damien Neil <dneil@google.com> Reviewed-by: Joel Sing <joel@sing.id.au> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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