The optimization removes the identity (or null) transform operator occurrences.
The struct x1f4_operator_type operator definition is to include the
X1f4_E4_LOSE_DATA bit in its flags bits list field.
See struct x1f4_operator_type.
See Prefix Unary Operator Flags.
It applies for such operators as the C unary ‘+’.
The optimization transforms expressions like:
+e
into:
e