[jdk11u-dev] RFR: 8268369: SIGSEGV in PhaseCFG::implicit_null_check due to missing null check

[Martin Doerr]

This trivial null check fix should get backported for parity with 11.0.13-oracle.

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Commit messages:
 - Backport 4ad8b04421f3142c396ade26f36334da7a915b5b

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/108/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=108&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268369
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/108.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/108/head:pull/108

PR: https://git.openjdk.java.net/jdk11u-dev/pull/108