RFR: 8294679: RISC-V: Misc crash dump improvements

[Aleksey Shipilev]

On Fri, 30 Sep 2022 14:41:05 GMT, Fei Yang <fyang at openjdk.org> wrote:

> Issue https://bugs.openjdk.org/browse/JDK-8294160 only handles x86 & aarch64.
> This adds handling for this case on RISC-V: When calling a bad address, we usually don't get a meaningful stack backtrace, but in many situations we can if we know where to find the caller information.
> 
> Testing: Tier1 tested on HiFive Unmatched board.

Marked as reviewed by shade (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/10512