Fix some issues in handling of withoutActuallyEscaping. #9695
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We need to strip inout/lvalue before casting the second parameter's type
to FunctionType.
There were also some verification issues and the fact that we weren't
allowing already-escaping closures to be passed to it (which is not
useful, but shouldn't result in an error and really awful
diagnostic). We can potentially look at diagnosing this with a warning
at some point in the future.
Fixes rdar://problem/32239354.