Renamed and reargumented isNamedExpression -> isValidExpressionContainer.
Renamed and reargumented isNamedExpression -> isValidExpressionContainer.

stevenp/jsxlate,stevenp/jsxlate,idealist/react-extract,zbyte64/jsxlate,drd/jsxlate,drd/jsxlate,zbyte64/jsxlate