Integrated: 8262313: Override stencilAttachmentPixelFormat to maintain appropriate state

[Jayathirth D V]

Override stencilAttachmentPixelFormat within same encoder when we move from stencil based opcodes to other opcodes.

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Commit messages:
 - 8262313: Override stencilAttachmentPixelFormat to maintain appropriate state

Changes: https://git.openjdk.java.net/lanai/pull/203/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=203&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262313
  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/lanai/pull/203.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/203/head:pull/203

PR: https://git.openjdk.java.net/lanai/pull/203