[jdk19u] RFR: 8293100: RISC-V: Need to save and restore callee-saved FloatRegisters in StubGenerator::generate_call_stub

[Vladimir Kempik]

On Tue, 6 Sep 2022 12:27:56 GMT, Vladimir Kempik <vkempik at openjdk.org> wrote:

> Please review this backport to jdk19u.
> This fixes critical error in call_stub in risc-v
> APplies almost clean. Slightly different class names in surrounding code ( in vmreg_riscv.cpp ) prevents it being clean.

Testing in good on hifive.

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PR: https://git.openjdk.org/jdk19u/pull/19