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

Fri Sep 30 14:48:01 UTC 2022

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.

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Commit messages:
 - 8294679: RISC-V: Misc crash dump improvements

Changes: https://git.openjdk.org/jdk/pull/10512/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10512&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294679
  Stats: 8 lines in 1 file changed: 6 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/10512.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10512/head:pull/10512

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