Remove an obsolete workaround for error variables. #65483
Merged
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This is a revert of the workaround for creating debug info for error variables in b2109ab, while leaving the test added back then in place. The compiler is now emitting debug info for the error pattern binding as it's supposed to and after the recent migration to stricter debug scope generation, there are now situations where the variable added for the workaround and the correct one are in conflict.
rdar://108576484