Mark Lacey 8d115b8e73 Revert "Allow inout arguments that differ in optionality than the expected parameter." ...

This partially reverts commit 8685ee01a1.

The tests are still in place, but the code change is no longer necessary
now that IUOs are removed from the type system.

Fixes: rdar://problem/37013789

2018-01-31 12:15:58 -08:00

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