RFR: JDK-8323684: TypeMirror.{getAnnotationsByType, getAnnotation} return uninformative results [v2]

[Joe Darcy]

> Initial implementation to make TypeMirror.{getAnnotationsByType, getAnnotation} functional; tests to follow.

Joe Darcy has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Merge branch 'master' into JDK-8323684
 - Appease jcheck.
 - Add regression tests.
 - JDK-8323684: TypeMirror.{getAnnotationsByType, getAnnotation} return uninformative results

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17410/files
  - new: https://git.openjdk.org/jdk/pull/17410/files/284fea38..37711749

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17410&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17410&range=00-01

  Stats: 6778 lines in 149 files changed: 2586 ins; 3769 del; 423 mod
  Patch: https://git.openjdk.org/jdk/pull/17410.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17410/head:pull/17410

PR: https://git.openjdk.org/jdk/pull/17410