RFR: 8254105: allow static nested declarations [v7]

[Vicente Romero]

> Please review the fix for [JDK-8254105](https://bugs.openjdk.java.net/browse/JDK-8254105). The intention of the fix is to allow static members to be declared inside inner classes. The spec allowing this change can be seen at [Local and Nested Static Declarations](http://cr.openjdk.java.net/~gbierman/8246771/8246771-20200928/specs/local-statics-jls.html). This change is part of the [Records JEP](https://openjdk.java.net/jeps/395). The idea is to allow not only records to be defined inside inner classes but also interfaces, enums, static classes and methods.
> 
> TIA,
> Vicente
> 
> PS: the records spec can be accessed here [Record Classes](http://cr.openjdk.java.net/~gbierman/8246771/8246771-20200928/specs/records-jls.html). This patch also adds a test to check the changes in the Records spec to Chapter 13 "Binary Compatibility". I'm OK moving that test to a separate PR.

Vicente Romero has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains seven commits:

 - Merge branch 'master' into JDK-8254105
 - addressing review comments
 - manual merge with master branch
 - removing duplicated test
 - test cleanup
 - Merge branch 'master' into JDK-8254105
 - 8254105: allow static members in inner classes, add binary compatibility tests

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Changes: https://git.openjdk.java.net/jdk/pull/571/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=571&range=06
  Stats: 758 lines in 26 files changed: 313 ins; 191 del; 254 mod
  Patch: https://git.openjdk.java.net/jdk/pull/571.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/571/head:pull/571

PR: https://git.openjdk.java.net/jdk/pull/571