RFR: 8287600: AA Ovals not rendered under metal

[Alexey Ushakov]

Commit command buffer after MTL_OP_MASK_OP operation

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Commit messages:
 - 8287600: AA Ovals not rendered under metal

Changes: https://git.openjdk.java.net/jdk/pull/8981/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8981&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8287600
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8981.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8981/head:pull/8981

PR: https://git.openjdk.java.net/jdk/pull/8981