RFR: do not generate null checks for record patterns

[Vicente Romero]

do not generate null checks for record patterns

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Commit messages:
 - do not generate null checks for record patterns

Changes: https://git.openjdk.org/valhalla/pull/1884/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1884&range=00
  Stats: 8 lines in 2 files changed: 7 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/1884.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1884/head:pull/1884

PR: https://git.openjdk.org/valhalla/pull/1884