RFR: 8261638: Lanai: crash in Clipping tab of J2Demo

[Alexey Ushakov]

Pass stencilNeeded flag to pipelineStateStorage

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Commit messages:
 - 8261638: Lanai: crash in Clipping tab of J2Demo

Changes: https://git.openjdk.java.net/lanai/pull/186/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=186&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261638
  Stats: 21 lines in 3 files changed: 20 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/lanai/pull/186.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/186/head:pull/186

PR: https://git.openjdk.java.net/lanai/pull/186