8262889: Compiler implementation for Record Patterns

A first version of a patch that introduces record patterns into javac as a 
preview feature. For the specification, please see:

There are two notable tricky parts:
-in the parser, it was necessary to improve the `analyzePattern` method to 
handle nested/record patterns, while still keeping error recovery reasonable
-in the `TransPatterns`, the desugaring of the record patterns is very 
straightforward - effectivelly the record patterns are desugared into 
guards/conditions. This will likely be improved in some future version/preview

`MatchException` has been extended to cover additional cases related to record 


Depends on: https://git.openjdk.java.net/jdk/pull/8182

Commit messages:
 - 8262889: Compiler implementation for Record Patterns

Changes: https://git.openjdk.java.net/jdk/pull/8516/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8516&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262889
  Stats: 2008 lines in 45 files changed: 1943 ins; 15 del; 50 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8516.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8516/head:pull/8516

PR: https://git.openjdk.java.net/jdk/pull/8516

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