[jdk11u-dev] RFR: 8250588: Shenandoah: LRB needs to save/restore fp registers for runtime call

[Aleksey Shipilev]

On Wed, 7 Jul 2021 09:23:08 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Unclean backport, because Shenandoah LRB-native is not present in 11u (was added later to support concurrent weak roots).
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `hotspot_gc_shenandoah`

Got the push approval.

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PR: https://git.openjdk.java.net/jdk11u-dev/pull/105