RFR: 8284699: Include all image types to the J2DBench.ColorConvertOpTests

[Sergey Bylokhov]

The J2DBench.ColorConvertOp tests are used to track the performance of the littlecms library in the JDK. The new version of the littlecms will add support for the premultiplied alpha. But right now the J2DBench does not test the pre-alpha formats, so I have added all standard types we have.

FYI: I have tested all combinations of these flags w/o issues.

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Commit messages:
 - Update ColorConvertOpTests.java
 - Initial version of JDK-8284699

Changes: https://git.openjdk.java.net/jdk/pull/8188/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8188&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8284699
  Stats: 15 lines in 1 file changed: 11 ins; 1 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8188.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8188/head:pull/8188

PR: https://git.openjdk.java.net/jdk/pull/8188