RFR: 8300543 Compiler Implementation for Pattern Matching for switch [v4]

[Jan Lahoda]

> This is the first draft of a patch for JEP 440 and JEP 441. Changes included:
> 
>  - the pattern matching for switch and record patterns features are made final, together with updates to tests.
>  - parenthesized patterns are removed.
>  - qualified enum constants are supported for case labels.
> 
> This change herein also includes removal record patterns in for each loop, which may be split into a separate PR in the future.

Jan Lahoda has updated the pull request incrementally with one additional commit since the last revision:

  Replacing use of mutable callsite with a mutable state.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13074/files
  - new: https://git.openjdk.org/jdk/pull/13074/files/bb59254e..d3d9cc60

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13074&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13074&range=02-03

  Stats: 44 lines in 1 file changed: 15 ins; 23 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/13074.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13074/head:pull/13074

PR: https://git.openjdk.org/jdk/pull/13074