RFR: 8301067: RISC-V: better error message when reporting unsupported satp modes [v2]

[Feilong Jiang]

> Add more detailed information to the error log when reporting unsupported stap modes.
> Currently, RISC-V port only supports up to sv48.

Feilong Jiang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into better_error_info
 - add more information when reporting unsuppoted satp modes

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/12247/files
  - new: https://git.openjdk.org/jdk/pull/12247/files/8fa7d999..6224eaef

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12247&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12247&range=00-01

  Stats: 5608 lines in 302 files changed: 891 ins; 156 del; 4561 mod
  Patch: https://git.openjdk.org/jdk/pull/12247.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12247/head:pull/12247

PR: https://git.openjdk.org/jdk/pull/12247