[jdk11u-dev] RFR: 8268019: C2: assert(no_dead_loop) failed: dead loop detected

[Martin Doerr]

Backport of JDK-8268019. Applies cleanly, but test needs modification. Some VM options from the original test are not available in 11u.

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Commit messages:
 - Backport 489e5fd12a37a45f4f5ea64b05f85c6f99f70811

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/342/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=342&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268019
  Stats: 80 lines in 2 files changed: 75 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/342.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/342/head:pull/342

PR: https://git.openjdk.java.net/jdk11u-dev/pull/342