Test case for issue #138, Don't run getters on assignment
 Fixes #138, Don't run getters on assignment

Rather than returning a temp from _transformBinaryAssignmentOperator,
return the assignment expression. To trace the LHS, create another temp.
This temp must have the traceId of the RHS, so plumb an optional value
thru to set it.
Output the traceId on the UI for tokens if we are debuggging TokenViewModel
Remove test case for not tracing literals now that we are...