s390x/s390xasm: fix plan9 disassembly regressions on s390x

Regressions were seen in plan9 disassembled syntax on s390x machines.
Raising a CL to fix all of them.

Below are the plan9 syntax regressions noticed:
1) LARL was printed instead of MOVD.
2) Operands for LGDR and LCDBR were printed in a reverse order.
3) MADBR was printed instead of FMADD.
4) VFM was printed instead of WFMDB. Also the mask fields were unnecessarily getting printed.
5) VFS was printed instead of WFSDB. Also the mask fields were unnecessarily getting printed.
6) JMP was printed instead of BR.
7) JMP R14 was printed instead of RET.
8) BRC was printed instead of BVS.

Change-Id: I9166f8ab51ad827bfeeed24a219ceb9b8c41c470
Reviewed-on: https://go-review.googlesource.com/c/arch/+/663756
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
3 files changed
tree: 9a13d805d722df36187cdf330ae0ec67748ace93
  1. arm/
  2. arm64/
  3. internal/
  4. loong64/
  5. ppc64/
  6. riscv64/
  7. s390x/
  8. x86/
  9. codereview.cfg
  10. CONTRIBUTING.md
  11. go.mod
  12. go.sum
  13. LICENSE
  14. PATENTS
  15. README.md
README.md

arch

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