RFR: improvements to lint warning on method overriding [v2]

[Vicente Romero]

> Adding a bit more of information to the warning message so that the overrided method or the target, in the case of lambdas and method references, can be easier to find

Vicente Romero has updated the pull request incrementally with one additional commit since the last revision:

  additional test

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/2098/files
  - new: https://git.openjdk.org/valhalla/pull/2098/files/84cf067b..5777d6d9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=2098&range=01
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=2098&range=00-01

  Stats: 17 lines in 1 file changed: 16 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/2098.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2098/head:pull/2098

PR: https://git.openjdk.org/valhalla/pull/2098