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Fix ParallelListComp out of scope suggestion

Aaron Allen requested to merge aaronallen8455/ghc:aallen/#22940/parallel-list-comp-fix into master

This patch makes it so vars from one block of a parallel list comprehension are not in scope in a subsequent block during type checking. This was causing GHC to emit a faulty suggestion when an out of scope variable shared the occ name of a var from a different block.

Fixes #22940 (closed)

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