RFR: 8316998: Remove redundant type arguments

[Paul Sandoz]

On Wed, 27 Sep 2023 00:58:01 GMT, Mourad Abbay <duke at openjdk.org> wrote:

> Remove cases of redundant type arguments in the java.util.stream package.

Looks like there are a few others in the package. In `Collectors`, see see construction of `CollectorImpl`. See also `DistinctOp`, `DoublePipeline`, `IntPipeline`, `LongPipeline`, `ReferencePipeline`, and `WhileOps`.

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PR Comment: https://git.openjdk.org/jdk/pull/15936#issuecomment-1738008502