Array.Parallel.forall , Array.Parallel.exists

[T-Gro]

This is another part of the RFC to expand the Array.Parallel module, based on fsharp/fslang-suggestions#187 .

There are two functions for logical tests, forall and exists.

• They can fully step if a matching (resp. not matching for exists) element is found
• They do not need to return the first index (unlike tryFind etc.), therefore ParallelLoopState.Stop() can be used instead of .Break()
• No synchronization across worker threads is needed in this case

[psfinaki]

/azp run

[azure-pipelines]

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