RFR: 8340125: [lw5] null checks are not being generated for method invocations and array writes

[Vicente Romero]

javac is not generating null checks for runtime execution for method invocations and array writes

-------------

Commit messages:
 - Merge with remote branch
 - 8340125: [lw5] null checks are not being generated for method invocations and array writes
 - 8340125: [lw5] null checks are not being generated for method invocations and array writes

Changes: https://git.openjdk.org/valhalla/pull/1251/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1251&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340125
  Stats: 328 lines in 6 files changed: 272 ins; 22 del; 34 mod
  Patch: https://git.openjdk.org/valhalla/pull/1251.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1251/head:pull/1251

PR: https://git.openjdk.org/valhalla/pull/1251