RFR: 8300247: Harden C1 xchg on AArch64 and PPC [v2]

[Erik Österlund]

On Thu, 26 Jan 2023 14:21:13 GMT, Roberto Castañeda Lozano <rcastanedalo at openjdk.org> wrote:

> Looks good.

Thanks for the review!

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PR: https://git.openjdk.org/jdk/pull/12065