Integrated: 8254869: Refactor check_previous_op usage in Mask Fill

[Jayathirth D V]

Remove declaration of check_previous_op and use it in MTLRenderQueue for Mask Fill operations as it is done for other
op codes.

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Commit messages:
 - 8254869: Refactor check_previous_op usage in Mask Fill

Changes: https://git.openjdk.java.net/lanai/pull/116/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=116&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254869
  Stats: 6 lines in 3 files changed: 3 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/lanai/pull/116.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/116/head:pull/116

PR: https://git.openjdk.java.net/lanai/pull/116