8345296: AArch64: VM crashes with SIGILL when prctl is disallowed

[krk]

Ref. openjdk/jdk#22479

We have caught this in some prod environments, where prctl is forbidden by the sandboxing mechanism. This fails the JVM

Does not apply cleanly, the backport depends on FloatRegister changes from JDK-8339063 which are included in src/hotspot/cpu/aarch64/register_aarch64.hpp.

Additional testing:

• Verified the bug is fixed with the seccomp repro from JDK-8345296: Segfault without the patch, works with.

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Progress

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Issue

• JDK-8345296: AArch64: VM crashes with SIGILL when prctl is disallowed (Bug - P3)

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[openjdk]

This backport pull request has now been updated with issue from the original commit.

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