RFR: 8287433: [PPC64] g1_write_barrier_pre needs extension for Loom

[Martin Doerr]

On Fri, 27 May 2022 11:10:28 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> Loom uses `c2i_entry_barrier` which needs to preserve more registers than currently implemented in `g1_write_barrier_pre`. See JBS for details.

Thank you for testing and for the reviews!

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PR: https://git.openjdk.java.net/jdk/pull/8918