[jdk13u-dev] RFR: 8247763: assert(outer->outcnt() == 2) failed: 'only phis' failure in LoopNode::verify_strip_mined()

[Olga Mikhaltsova]

I'd like to backport JDK-8247763 to jdk13u for parity with jdk11u.
The original patch applied cleanly.
Tested with the test attached to the issue.
All regular tests passed as well.

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Commit messages:
 - Backport 5adfaa39866f3127000f0779158c65afe1d24007

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/202/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=202&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8247763
  Stats: 72 lines in 2 files changed: 72 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/202.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/202/head:pull/202

PR: https://git.openjdk.java.net/jdk13u-dev/pull/202