FYI: 8242354: implemented MaskBlit

[Artem Bochkarev]

implemented MaskBlit

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Commit messages:
 - 8242354: implemented MaskBlit

Changes: https://git.openjdk.java.net/lanai/pull/36/files
 Webrev: https://webrevs.openjdk.java.net/lanai/36/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8242354
  Stats: 26 lines in 1 file changed: 21 ins; 2 del; 3 mod
  Patch: https://git.openjdk.java.net/lanai/pull/36.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/36/head:pull/36

PR: https://git.openjdk.java.net/lanai/pull/36