8388838: RISC-V: vectorization tests failed when UseUnalignedAccesses is false

[kuaiwei]

Some vectorization jtreg tests failed on riscv SG2044. The root cause is UseUnalignedAccesses is disable by default on this machine, so super word optimization is blocked in these tests. We need check this flag before testing.

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• JDK-8388838: RISC-V: vectorization tests failed when UseUnalignedAccesses is false (Enhancement - P4)

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