cmd/internal/obj/riscv: update references to RISC-V specification
Update references to version
20240411 of the RISC-V specifications.
Reorder and regroup instructions to maintain ordering. Also be
consistent with formatting.
The instruction encodings table was seemingly missed in CL 616115.
Change-Id: I47b7c8538383ff3b0503ba59db570c3d4f0d5653
Reviewed-on: https://go-review.googlesource.com/c/go/+/631935
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Meng Zhuo <mengzhuo1203@gmail.com>
Reviewed-by: Pengcheng Wang <wangpengcheng.pp@bytedance.com>