[jdk11u-dev] RFR: 8295788: C2 compilation hits "assert((mode == ControlAroundStripMined && use == sfpt) || !use->is_reachable_from_root()) failed: missed a node"

[Goetz Lindenmaier]

I backport this for parity with 11.0.19-oracle.

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Commit messages:
 - Backport 761a4f4852cbb40660b6fb9eda4d740464218f75

Changes: https://git.openjdk.org/jdk11u-dev/pull/1658/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1658&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295788
  Stats: 85 lines in 2 files changed: 68 ins; 0 del; 17 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1658.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1658/head:pull/1658

PR: https://git.openjdk.org/jdk11u-dev/pull/1658