RFR: 8300929: Avoid unnecessary array fill after creation in java.awt.image

[Andrey Turbanov]

No need to fill elements of array with default values if it was just created. Java guarantees that all elements of numeric array have default values after allocations - 0.

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Commit messages:
 - [PATCH] Avoid unnecessary array fill after creation in java.awt.image

Changes: https://git.openjdk.org/jdk/pull/12147/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12147&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300929
  Stats: 37 lines in 5 files changed: 1 ins; 30 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/12147.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12147/head:pull/12147

PR: https://git.openjdk.org/jdk/pull/12147