git: openjdk/jdk: 8299844: RISC-V: Implement _onSpinWait intrinsic

[Fei Yang]

Changeset: af564e46
Author:    Yadong Wang <yadongwang at openjdk.org>
Committer: Fei Yang <fyang at openjdk.org>
Date:      2023-01-28 02:17:44 +0000
URL:       https://git.openjdk.org/jdk/commit/af564e46b006fcd57ec7391cd1438b3b9311b1d6

8299844: RISC-V: Implement _onSpinWait intrinsic

Reviewed-by: fjiang, fyang, luhenry

! src/hotspot/cpu/riscv/assembler_riscv.hpp
! src/hotspot/cpu/riscv/c1_LIRAssembler_riscv.cpp
! src/hotspot/cpu/riscv/globals_riscv.hpp
! src/hotspot/cpu/riscv/macroAssembler_riscv.hpp
! src/hotspot/cpu/riscv/riscv.ad
! src/hotspot/cpu/riscv/vm_version_riscv.cpp
! src/hotspot/cpu/riscv/vm_version_riscv.hpp
+ test/hotspot/jtreg/compiler/onSpinWait/TestOnSpinWaitRISCV64.java