RFR: 8303374: Compiler Implementation for Primitive types in patterns, instanceof, and switch (Preview)

[Aggelos Biboudis]

This is the first draft of a patch for Primitive types in patterns, instanceof, and switch (Preview).

Draft spec here: https://cr.openjdk.org/~abimpoudis/instanceof/instanceof-20230913/specs/instanceof-jls.html

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Commit messages:
 - 8303374: Compiler Implementation for Primitive types in patterns, instanceof, and switch (Preview)

Changes: https://git.openjdk.org/jdk/pull/15638/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15638&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303374
  Stats: 2293 lines in 29 files changed: 2186 ins; 16 del; 91 mod
  Patch: https://git.openjdk.org/jdk/pull/15638.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15638/head:pull/15638

PR: https://git.openjdk.org/jdk/pull/15638