Issue 3769: Lexer/Parser: Don't package location data in SCM_TOKEN semantic value

Issue 3769: Lexer/Parser: Don't package location data in SCM_TOKEN semantic value

As the location data is available as the location value in the parser
anyway, there is no point in packaging it into the semantic value.
Among other things, this leads to a cleaner display when using
-ddebug-parser, and to better understandable code.