[jdk17u-dev] RFR: 8292285: C2: remove unreachable block after NeverBranch-to-Goto conversion

[Goetz Lindenmaier]

I backport this for parity with 17.0.7-oracle.

Requires follow-up 8292660.

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Commit messages:
 - Backport a25e1dc53cecc5dd917ac0f76fd86ef1f074adba

Changes: https://git.openjdk.org/jdk17u-dev/pull/974/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=974&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292285
  Stats: 24 lines in 1 file changed: 18 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/974.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/974/head:pull/974

PR: https://git.openjdk.org/jdk17u-dev/pull/974