[jdk17u-dev] RFR: 8320276: Improve class initialization barrier in TemplateTable::_new

[Matt]

On Wed, 16 Apr 2025 19:44:34 GMT, Matt <duke at openjdk.org> wrote:

> This PR backports 8320276 to support backporting 8338379, see the comment thread linked below. This was a clean backport, though reviewers may want to confirm that the decision to include [this function](https://github.com/openjdk/jdk17u-dev/blob/f19121cc65199f2052c69747dfa7ae8d209596f4/src/hotspot/cpu/ppc/vm_version_ppc.hpp#L135) was correct. 
> 
> ---------
> ### Progress
> - [ ] Change must be properly reviewed (1 review required, with at least 1 [Reviewer](https://openjdk.org/bylaws#reviewer))
> - [x] Change must not contain extraneous whitespace
> - [x] Commit message must refer to an issue
> - [ ] [JDK-8320276](https://bugs.openjdk.org/browse/JDK-8320276) needs maintainer approval
> 
> 
> 
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This is in support of #3317, see https://github.com/openjdk/jdk17u-dev/pull/3317#discussion_r2032691620

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PR Comment: https://git.openjdk.org/jdk17u-dev/pull/3508#issuecomment-2810603084