RFR: 8324125: Improve class initialization barrier in TemplateTable::_new for RISC-V

[Gui Cao]

Hi, This RISC-V Port implementation for https://github.com/openjdk/jdk/pull/17006,

### Testing:

- [x]  Run tier1-3 tests on qemu 8.1.0 with UseRVV (fastdebug)
- [x]  Run tier1-3 tests with SiFive unmatched (release)

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Commit messages:
 - JDK-8324125: Improve class initialization barrier in TemplateTable::_new for RISC-V

Changes: https://git.openjdk.org/jdk/pull/17548/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17548&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324125
  Stats: 5 lines in 1 file changed: 0 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/17548.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17548/head:pull/17548

PR: https://git.openjdk.org/jdk/pull/17548