Eliminate deep disjunctive patterns. #830
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W95Psp
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Closes #463.
We add a new monomorphic phase that lifts up all deep disjunctive patterns so that the resulting patterns may only contain shallow disjunctions.
For example the pattern
(1 | 2, Some(3 | 4))is transformed as(1, Some(3)) | (1, Some(4)) | (2, Some(3)) | (2, Some(4))