scheck: constants are untyped

in sparse, constants (PSEUDO_VALs) are not typed, so the same pseudo
can be used to represent 1-bit 0, 8-bit 0, 16-bit 0, ...

That's incompatible with the bit vectors used here, so we can't associate
a PSEUDO_VAL with its own bitvector like it's done for PSEUDO_REGs.
A fresh one is needed for each occurrence (we could use a small table
but won't bother).

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
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