[jdk17u] RFR: 8271341: Opcode() != Op_If && Opcode() != Op_RangeCheck) || outcnt() == 2 assert failure with Test7179138_1.java

[Tobias Hartmann]

Backport of [JDK-8271341](https://bugs.openjdk.java.net/browse/JDK-8271341). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8271341: Opcode() != Op_If && Opcode() != Op_RangeCheck) || outcnt() == 2 assert failure with Test7179138_1.java

Changes: https://git.openjdk.java.net/jdk17u/pull/106/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=106&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271341
  Stats: 19 lines in 2 files changed: 17 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/106.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/106/head:pull/106

PR: https://git.openjdk.java.net/jdk17u/pull/106