RFR: 8320234: Merge doclint.Env.AccessKind with tool.AccessKind [v2]

[Pavel Rappo]

> Back when DocLint lived in jdk.compiler, neither jdk.javadoc had access to DocLint, nor DocLint had access to jdk.javadoc. Since DocLint moved to jdk.javadoc, some redundancy can be eliminated and functionality shared; AccessKind is one such functionality.
> 
> There's more that could be done here. For example, jdk.javadoc.internal.doclint.Messages.Options can be simplified more. However, it's a separate issue.

Pavel Rappo has updated the pull request incrementally with one additional commit since the last revision:

  Remove assert, but implement Comparable explicitly

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16714/files
  - new: https://git.openjdk.org/jdk/pull/16714/files/ed52bdaf..2def7bf9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16714&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16714&range=00-01

  Stats: 8 lines in 1 file changed: 0 ins; 7 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/16714.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16714/head:pull/16714

PR: https://git.openjdk.org/jdk/pull/16714