RFR: JDK-8297216: Search results omit some methods

[Hannes Wallnöfer]

Please review a fix for a bug where a method's parameter type could "mask" a method and result in the method to not appear in the search results. The fix consists in checking whether a match covers an element's name in the match loop. 

Note that the added test must be run manually as it requires GraalVM JS (or some other JS engine) to be installed. In addition to running the test I did extensive A/B testing to make sure search results remain unchanged apart from the bug fix.

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Commit messages:
 - JDK-8297216: Search results omit some methods

Changes: https://git.openjdk.org/jdk/pull/11287/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11287&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297216
  Stats: 53 lines in 2 files changed: 33 ins; 14 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/11287.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11287/head:pull/11287

PR: https://git.openjdk.org/jdk/pull/11287