[jdk11u-dev] RFR: 8266480: Implicit null check optimization does not update control of hoisted memory operation

[Martin Doerr]

JDK-8266480 should get backported for parity with 11.0.13-oracle. Applies cleanly.

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Commit messages:
 - Backport c2b50f93ac36cdfd96d3ed09ec80ee5255a10200

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/63/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=63&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266480
  Stats: 64 lines in 2 files changed: 63 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/63.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/63/head:pull/63

PR: https://git.openjdk.java.net/jdk11u-dev/pull/63