[jdk11u-dev] RFR: 8295116: C2: assert(dead->outcnt() == 0 && !dead->is_top()) failed: node must be dead

[Goetz Lindenmaier]

I backport this for parity with 11.0.19-oracle.

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Commit messages:
 - Backport 94575d14f47e2dfb11b671bce26b69270b6bb3c8

Changes: https://git.openjdk.org/jdk11u-dev/pull/1719/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1719&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295116
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1719.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1719/head:pull/1719

PR: https://git.openjdk.org/jdk11u-dev/pull/1719