SI-6863 Fix verify error in captured var inited from block w try/catch

If a captured var was inited from a try/catch we did something
reasonable. But if the var was inited from a block that ended with
a try/catch then we didn't and we were generating faulty byte code.
This fix patches LambdaLift to add the missing case. It also
removes a related, but no longer valid comment from UnCurry. A
test is included.

review @magarciaEPFL