RFR: 7903782: clang warnings and diagnostics below warning level should be logged as well [v2]

[Athijegannathan Sundararajan]

> Parser logs clang warnings and diagnostics below warning level as well.

Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last revision:

  removed ClangException. no bail out at the first clang error.
  all clang errors, warnings and info (note) messages are printed to logger
  by separate non-property key accepting methods of logger.

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Changes:
  - all: https://git.openjdk.org/jextract/pull/255/files
  - new: https://git.openjdk.org/jextract/pull/255/files/1a9347cb..24794e0b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jextract&pr=255&range=01
 - incr: https://webrevs.openjdk.org/?repo=jextract&pr=255&range=00-01

  Stats: 125 lines in 5 files changed: 37 ins; 81 del; 7 mod
  Patch: https://git.openjdk.org/jextract/pull/255.diff
  Fetch: git fetch https://git.openjdk.org/jextract.git pull/255/head:pull/255

PR: https://git.openjdk.org/jextract/pull/255