cmd/internal/obj/riscv: add support for Zicond instructions
This patch implement assembler for the Zicond extension: CZEROEQZ and CZERONEZ.
Follow-up to CL 631576
Updates #75350
Change-Id: Icf4be131fe61c3b7a3bde4811cf42dc807660907
GitHub-Last-Rev:
6539cc86cbf3c49c3247ed935bcbbb31bb886dea
GitHub-Pull-Request: golang/go#75408
Reviewed-on: https://go-review.googlesource.com/c/go/+/702677
Reviewed-by: Mark Freeman <markfreeman@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Meng Zhuo <mengzhuo1203@gmail.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Mark Ryan <markdryan@rivosinc.com>
TryBot-Bypass: Joel Sing <joel@sing.id.au>