8365772: RISC-V: correctly prereserve NaN payload when converting from float to float16 in vector way

[Hamlin-Li]

Hi,
Can you help to review this patch?

This is a follow-up of #26838, fixes the vector version in a similar way.

Thanks!

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Progress

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Issue

• JDK-8365772: RISC-V: correctly prereserve NaN payload when converting from float to float16 in vector way (Bug - P4)

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[mlbridge]

Webrevs

• 01: Full - Incremental (fa107180)
• 00: Full (446a403b)