RFR: 7903257: jextract should generate javadoc comments [v4]

[Athijegannathan Sundararajan]

> Generating C signature as doc comments.

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

  differentiating macros and enum constants. code cleanup in CDeclarationPrinter as suggested in review.

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Changes:
  - all: https://git.openjdk.org/jextract/pull/85/files
  - new: https://git.openjdk.org/jextract/pull/85/files/fab2ddb7..00f43b4c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jextract&pr=85&range=03
 - incr: https://webrevs.openjdk.org/?repo=jextract&pr=85&range=02-03

  Stats: 47 lines in 3 files changed: 30 ins; 1 del; 16 mod
  Patch: https://git.openjdk.org/jextract/pull/85.diff
  Fetch: git fetch https://git.openjdk.org/jextract pull/85/head:pull/85

PR: https://git.openjdk.org/jextract/pull/85