RFR: 8303374: Compiler Implementation for Primitive types in patterns, instanceof, and switch (Preview) [v34]

[Aggelos Biboudis]

> This is the proposed patch for Primitive types in patterns, instanceof, and switch (Preview).
> 
> Draft spec here: https://cr.openjdk.org/~abimpoudis/instanceof/latest/

Aggelos Biboudis has updated the pull request incrementally with 11 additional commits since the last revision:

 - Merge branch 'primitive-patterns-and-generating-dispatch' into primitive-patterns
 - Fixed switch in the cases of unboxing and widening
 - Merge branch 'JDK-8319220' into primitive-patterns
 - Merge branch 'master' into JDK-8319220
 - reflecting review comment: fixing letter case.
 - Reflecting review feedback.
 - Some more get->orElseThrow
 - Reflecting review feedback.
 - Avoiding generating dead code - review feedback.
 - Cleanup.
 - ... and 1 more: https://git.openjdk.org/jdk/compare/2b2405cc...fac9ca98

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15638/files
  - new: https://git.openjdk.org/jdk/pull/15638/files/2b2405cc..fac9ca98

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15638&range=33
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15638&range=32-33

  Stats: 689 lines in 5 files changed: 423 ins; 222 del; 44 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