bug#11604: USE_LISP_UNION_TYPE + USE_LSB_TAG cleanup.

[Andreas Schwab]

Paul Eggert <eggert@cs.ucla.edu> writes:

> Because the union type is for debugging, not for production.
> It's used mostly to make sure that (for example) one doesn't
> mistakenly write "x = y" when one meant to write "x = XINT (y)".

That doesn't make sense.  You don't need a bitfield for that, just a
struct around EMACS_INT.  If we want to go that route we should rip out
the union Lisp_Object completely.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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