RFR: 8355704: RISC-V: enable TestIRFma.java [v2]

[Hamlin Li]

> Hi,
> Can you help to review this patch to enable TestIRFma.java?
> FmaF/D (checked by TestIRFma.java) are supported on riscv, but for some reason we can not enable it easily, but we should enable it.
> 
> NOTE: the reason I change IRNode matching rules is that, previously it verify the `FINAL CODE` where every platform could have different instruct name; I change it from machOnlyNameRegex to beforeMatchingNameRegex, to make it verify the `PrintIdeal` where every platform share the same names.
> 
> Also tested on machine with `asimd` support.
> 
> Thanks!

Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:

  adjust IR verification

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/24947/files
  - new: https://git.openjdk.org/jdk/pull/24947/files/590f6ae8..10a819d3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24947&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24947&range=00-01

  Stats: 71 lines in 2 files changed: 28 ins; 5 del; 38 mod
  Patch: https://git.openjdk.org/jdk/pull/24947.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24947/head:pull/24947

PR: https://git.openjdk.org/jdk/pull/24947