git: openjdk/jdk: 8315856: RISC-V: Use Zacas extension for cmpxchg

[Ludovic Henry]

Changeset: 6313223b
Author:    Ludovic Henry <luhenry at openjdk.org>
Date:      2023-12-19 14:15:24 +0000
URL:       https://git.openjdk.org/jdk/commit/6313223bcd525aabf180813af76d500cf60893d3

8315856: RISC-V: Use Zacas extension for cmpxchg

Reviewed-by: rehn, fyang

! src/hotspot/cpu/riscv/assembler_riscv.hpp
! src/hotspot/cpu/riscv/globals_riscv.hpp
! src/hotspot/cpu/riscv/macroAssembler_riscv.cpp
! src/hotspot/cpu/riscv/macroAssembler_riscv.hpp
! src/hotspot/cpu/riscv/vm_version_riscv.hpp