RFR: 8333854: IllegalAccessError with proxies after JDK-8332457 [v4]

[Chen Liang]

> Please review this patch that fixes a critical issue that breaks some Proxy usages.
> 
> Since the problematic patch from before cannot be backed out, this patch aims to emulate the old behavior before. A diff between before the problematic patch and this patch is available at https://gist.github.com/7565b2091008f561eb0ada019bc5e517, generated by running `git diff 326dbb1b139dd1ec1b8605339b91697cdf49da9a -- src/java.base/share/classes/java/lang/reflect/ProxyGenerator.java`.

Chen Liang has updated the pull request incrementally with one additional commit since the last revision:

  More rename and code style cleanup

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/19615/files
  - new: https://git.openjdk.org/jdk/pull/19615/files/a57e0893..a510b1f4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19615&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19615&range=02-03

  Stats: 43 lines in 1 file changed: 6 ins; 4 del; 33 mod
  Patch: https://git.openjdk.org/jdk/pull/19615.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19615/head:pull/19615

PR: https://git.openjdk.org/jdk/pull/19615