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

[Fei Yang]

On Tue, 4 Oct 2022 07:13:39 GMT, Feilong Jiang <fjiang 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.
>
> LGTM

@feilongjiang @shipilev : Thanks for the review. Tier2-3 test is also clean.

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