RFR: 7903782: clang warnings and diagnostics below warning level should be logged as well [v3]

[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 nWarnings, nClangWarnings and associated unused 'has' check methods.

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Changes:
  - all: https://git.openjdk.org/jextract/pull/255/files
  - new: https://git.openjdk.org/jextract/pull/255/files/24794e0b..16fd72b6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jextract&pr=255&range=02
 - incr: https://webrevs.openjdk.org/?repo=jextract&pr=255&range=01-02

  Stats: 12 lines in 1 file changed: 0 ins; 12 del; 0 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