[jdk11u-dev] RFR: 8303564: C2: "Bad graph detected in build_loop_late" after a CMove is wrongly split thru phi

[Goetz Lindenmaier]

I backport this for parity with 11.0.20-oracle.

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Commit messages:
 - Backport 5e232cf0a96cf81036a2d9d7814127b7bc9ebab1

Changes: https://git.openjdk.org/jdk11u-dev/pull/1854/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1854&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303564
  Stats: 82 lines in 2 files changed: 80 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1854.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1854/head:pull/1854

PR: https://git.openjdk.org/jdk11u-dev/pull/1854