[jdk17u] RFR: 8276927: [ppc64] Port shenandoahgc to linux on ppc64le

[Martin Doerr]

On Thu, 18 Nov 2021 20:51:17 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> Backport of 8276927: [PPC64] Port shenandoahgc to linux on ppc64le.
> Applies cleanly, but a trivial resolution is required: add additional parameter `, false /*unaligned*/` to `mem2reg` in `ShenandoahBarrierSetAssembler::gen_pre_barrier_stub`.
> This is needed because "8269672: C1: Remove unaligned move on all architectures" is not in 17u.

Thanks for the review! I'm using this PR for testing. I'm planning to request 17u approval after some time (rather soon). Note that it was already tested for quite some time on our internal test infrastructure before we created the public PR.

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

PR: https://git.openjdk.java.net/jdk17u/pull/287