RFR: 8347563: C2: clean up ModRefBarrierSetC2

Mon Jan 20 10:35:40 UTC 2025

On Tue, 14 Jan 2025 17:47:59 GMT, Roberto Castañeda Lozano <rcastanedalo at openjdk.org> wrote:

> This cleanup removes `ModRefBarrierSetC2::pre_barrier()` (which is a no-op after [JDK-8334060](https://bugs.openjdk.org/browse/JDK-8334060)) and unused arguments of `ModRefBarrierSetC2::post_barrier()`. Thanks to @TobiHartmann for reporting!
> 
> **Testing:** tier1-3.

Thanks for reviewing, Albert!

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PR Comment: https://git.openjdk.org/jdk/pull/23112#issuecomment-2602040329