Remove ECast node from the Painless user tree #52915
Merged
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This change removes the ECast node from the user tree, so that there are no structural changes to the user tree making it structurally immutable. All generated casts are now built directly into the ir tree instead. This also removes the
isNull
member variable from AExpression because now an instanceof operator can be used instead of having to pass this information between potentially multiple levels of user tree nodes.Relates to #49869