Description
The main purpose is to turn the option UseRVC on by default. As per discussions [1], we can enable UseRVA20U64 by default to fulfill this.
[1] https://mail.openjdk.org/pipermail/riscv-port-dev/2022-November/000668.html
[1] https://mail.openjdk.org/pipermail/riscv-port-dev/2022-November/000668.html