RFR: 8338981: Access to private classes should be permitted inside the permits clause of the enclosing top-level class [v18]

[Evemose]

> Fix involves adding new flag to after context that indicates that currently resolved symbol is in permits clause

Evemose has updated the pull request incrementally with three additional commits since the last revision:

 - remove trailing whitespaces
 - Merge remote-tracking branch 'origin/selaed-permits-allow-private-members' into selaed-permits-allow-private-members
 - address review comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20718/files
  - new: https://git.openjdk.org/jdk/pull/20718/files/38dd1b5a..5fdfdf32

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20718&range=17
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20718&range=16-17

  Stats: 49 lines in 4 files changed: 0 ins; 41 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/20718.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20718/head:pull/20718

PR: https://git.openjdk.org/jdk/pull/20718