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