RFR: 8343468: GenShen: Enable relocation of remembered set card tables

[Cesar Soares Lucas]

On Fri, 17 Jan 2025 08:44:31 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> I do wonder if you can avoid a lot if not all arch-specific changes, if Shenandoah barrier set: a) does not use `MacroAssembler::load_byte_map_base` directly; b) returns deliberately bad pointer from `byte_map_base()`, so that C2 matcher would never match, and accidental use of `byte_map_base()` would cleanly crash.

@shipilev - are you suggesting to patch all `shenandoahBarrierSetAssembler_*` backend specific files to not use `load_byte_map`? It looks like we would end up in a similar situation if I go with the approach that you're suggesting - if I'm understanding it correctly.

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PR Comment: https://git.openjdk.org/jdk/pull/23170#issuecomment-2606259667