8345178: RISC-V: Add gtests for narrow cmpxchg

[robehn]

Hi, please consider.

This adds tests of aligned narrow cmpxchg.

Note: Google Test filter = *RiscV*
[==========] Running 5 tests from 1 test suite.
[----------] Global test environment set-up.
[----------] 5 tests from RiscV
...
[ RUN      ] RiscV.cmpxchg_int16_lr_sc_vm
[       OK ] RiscV.cmpxchg_int16_lr_sc_vm (2 ms)
[ RUN      ] RiscV.cmpxchg_int8_lr_sc_vm
[       OK ] RiscV.cmpxchg_int8_lr_sc_vm (1 ms)
[ RUN      ] RiscV.cmpxchg_int16_maybe_zacas_vm
[       OK ] RiscV.cmpxchg_int16_maybe_zacas_vm (1 ms)
[ RUN      ] RiscV.cmpxchg_int8_maybe_zacas_vm
[       OK ] RiscV.cmpxchg_int8_maybe_zacas_vm (1 ms)
[----------] 5 tests from RiscV (20831 ms total)

[----------] Global test environment tear-down
[==========] 5 tests from 1 test suite ran. (20834 ms total)
[  PASSED  ] 5 tests.

Executed with -XX:+UnlockExperimentalVMOptions -XX:+UseZacas

Thanks, Robbin

---

Progress

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Issue

• JDK-8345178: RISC-V: Add gtests for narrow cmpxchg (Sub-task - P4)

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[bridgekeeper]

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[openjdk]

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[robehn]

/label add hotspot

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