Actually share reference to text in CommonToken.fromToken #415
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This looks like a java conversion error.
The doc comment above (and java version) attempt to share the string/reference if the fromToken is a CommonToken.
However, the field got underscored'd in the conversion to typescript, and it looks like only the LHS got updated.
The upshot is that the without this change, if oldToken is a CommonToken, it will retrieve and copy the text from the oldToken, not share it.
With this change, it will share the reference if possible.