function markReturnStatementsOnCurrentSegmentsAsUsed() {
			scopeInfo.currentSegments.forEach(segment =>
				markReturnStatementsOnSegmentAsUsed(segment, new Set()),
			);
		}
Removes the return statements on the current segments from the useless
return statement list.

This function will be called at every statement except FunctionDeclaration,
BlockStatement, and BreakStatement.

- FunctionDeclarations are always executed whether it's returned or not.
- BlockStatements do nothing.
- BreakStatements go the next merely.
@returns {void}