RFR: 8324125: Improve class initialization barrier in TemplateTable::_new for RISC-V [v2]

[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)

Gui Cao has updated the pull request incrementally with one additional commit since the last revision:

  Put the msg string on a separate line

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17548/files
  - new: https://git.openjdk.org/jdk/pull/17548/files/ae736225..0935a0b7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17548&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17548&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 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