0.8.8.10:

0.8.8.10:
	MORE MICRO-OPTIMIZATION
	... renumber all widetags.  (LESS BINARY-COMPATIBILITY)
	... implement some smarter type tag checking on the x86.

	The smarter type checking comes in several flavours.

	* If we have two adjacent lowtags, in three cases out of four
	  we can do "and, cmp, branch", rather than
	  "cmp, branch, cmp, branch";
	* If we have two lowtags that are unadjacent but differ by
	  just one bit, we can likewise do "and, cmp, branch" rather
	  than "cmp, branch, cmp, branch";
	* If we have a contiguous range of lowtags that includes the
	  most positive lowtag, we do not need to test the upper bound;
	* If we have four lowtags with only two bits different, we can
	  do "and, cmp, branch" rather than *four* "cmp, branch" pairs.

	This change will conflict with ongoing 64-bit ports.  The
	conflict is resolvable (there are enough widetags in the "array"
	range (which in practice is 130 - 254; currently there are five
	in this range unused (or three with long-float arrays)