RFR: 8346280: C2: implement late barrier elision for G1

[Roberto Castañeda Lozano]

On Fri, 24 Jan 2025 01:23:58 GMT, Fei Yang <fyang at openjdk.org> wrote:

> FYI: `gtest:all` and `tier1` results are clean on linux-riscv64 with this change. And `compiler/gcbarriers/TestG1BarrierGeneration.java` passes with both release and fastdebug builds on this platform.

Thanks for testing @RealFYang!

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PR Comment: https://git.openjdk.org/jdk/pull/23235#issuecomment-2612074571