bv-to-int: Expand definitions of bvudiv and bvurem during bv-to-int preprocessing...

bv-to-int: Expand definitions of bvudiv and bvurem during bv-to-int preprocessing pass (#5620)

#5544 enforces expandDefinition not to run before preprocessing.
The bv-to-int preprocessing pass used to rely on expandDefinition to replace BITVECTOR_UDIV and BITVECTOR_UREM with their _TOTAL versions.
This PR performs the replacement in the preprocessing pass itself.
A regression that timed out is now fixed and is brought back to the regressions.