Don't error out when EH is used for Flatten (#3526)

We used to error out in Flatten when EH is used because Flatten makes
all block types `none` by setting their return values to locals and
getting them later, but `br_on_exn` by definition pops value from the
value stack at the end of a block so it couldn't be flattened. Now that
we don't have `br_on_exn` we don't need these restriction.

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