RFR: 8341408: Implement JEP 488: Primitive Types in Patterns, instanceof, and switch (Second Preview) [v3]

[Aggelos Biboudis]

> This PR prepares the improvement for JEP 488.
> 
> The proposed approach is described in the CSR.
> 
> In terms of compiler implementation, we add the related translation in `TransPatterns`. Interestingly, this issue would be ideally addressed in `TransTypes`. However, there are some conveniences in `TransPatterns` that would need to be pulled into `TransTypes` to make this work: 1) the dependency to `makeBinary` and transitively to `operators` and 2) a lot of ceremony around `currentMethodSym` is already setup nicely in `TransPatterns`.

Aggelos Biboudis 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 three additional commits since the last revision:

 - Merge branch 'master' into fix-#8341408
 - Address review
 - 8341408: Implement JEP 488: Primitive Types in Patterns, instanceof, and switch (Second Preview)

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21539/files
  - new: https://git.openjdk.org/jdk/pull/21539/files/c056b439..ab587198

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21539&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21539&range=01-02

  Stats: 106140 lines in 1693 files changed: 39061 ins; 62093 del; 4986 mod
  Patch: https://git.openjdk.org/jdk/pull/21539.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21539/head:pull/21539

PR: https://git.openjdk.org/jdk/pull/21539