[jdk17] RFR: 8268663: Crash when guards contain boolean expression

[Jan Lahoda]

When Flow analyzes boolean expressions, (un-)initialized are split into (un-)initialized when true and when false. When analyzing guarded patterns, we need to handle these split values. As the only way the case's body/statements can be executed is if the case's pattern matches, we need to use the initialized values when true.

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Commit messages:
 - 8268663: Crash when guards contain boolean expression

Changes: https://git.openjdk.java.net/jdk17/pull/41/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17&pr=41&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268663
  Stats: 39 lines in 2 files changed: 37 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/41.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/41/head:pull/41

PR: https://git.openjdk.java.net/jdk17/pull/41