[OpenJDK 2D-Dev] RFR: 8250658: Performance of ClipFlatOval Renderperf test is very low

[Alexey Ushakov]

Implemented indirect rendering (via stencil texture attachment) to stencil texture

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Commit messages:
 - 8250658: Performance of ClipFlatOval Renderperf test is very low

Changes: https://git.openjdk.java.net/jdk/pull/3929/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3929&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8250658
  Stats: 108 lines in 7 files changed: 27 ins; 75 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3929.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3929/head:pull/3929

PR: https://git.openjdk.java.net/jdk/pull/3929