[Bug target/106531] New: -march=rv32iabmc should also enable zba, zbb, zbc, zbs

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106531

            Bug ID: 106531
           Summary: -march=rv32iabmc should also enable zba, zbb, zbc, zbs
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: target
          Assignee: pinskia at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---
            Target: riscv

While doing some development, I Noticed that -march=rv32iabmc does not work
(binutils as fails but that is a different issue) and the zba, zbb, zbc, and
zbs extensions are not enabled like I think they should be.
I am filing this bug to remind me to submit the patch for this.