RFR: 8280713: Related to comment inheritance jdk.javadoc cleanup and refactoring [v2]

[Pavel Rappo]

> Explorative refactoring performed while looking into multiple `@inheritDoc` issues. The easiest way to review it is to, probably, go commit by commit; they are quite focused and commented. Not only the branch as a whole, but all the constituent commits should pass tests and leave JDK API Documentation unchanged.

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

  Fix ImplementedMethods.overridingMethodFound
  
  Removes code from VisibleMemberTable.ImplementedMethods.overridingMethodFound; the removed code is dead for the reasons similar to those in the previous commit. This commit makes overridingMethodFound degrade to linear search, which could be substituted with hashing in a later commit.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7233/files
  - new: https://git.openjdk.java.net/jdk/pull/7233/files/fb1dc89e..ad9b6273

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7233&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7233&range=00-01

  Stats: 9 lines in 1 file changed: 0 ins; 8 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7233.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7233/head:pull/7233

PR: https://git.openjdk.java.net/jdk/pull/7233