[jdk13u-dev] RFR: 8272570: C2: crash in PhaseCFG::global_code_motion

[Yuri Nesterenko]

fix applies cleanly, hotspot tests run OK

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Commit messages:
 - Backport 0f428ca533627e758cdca599d4589f39c21e27b6

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/311/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=311&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272570
  Stats: 55 lines in 2 files changed: 53 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/311.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/311/head:pull/311

PR: https://git.openjdk.java.net/jdk13u-dev/pull/311