0.7.2.8:

0.7.2.8:
	SPARC backend cleanups (more or less from CSR sbcl-devel
	2002-04-05)
	... s/fixnum-tag-bits/n-fixnum-tag-bits/
	... s/positive-fixnum-bits/n-positive-fixnum-bits/
	... a relative-branch on the SPARC is 22 bits, not 13 (thanks
		to Raymond Toy for discussion)
	... implement proper *backend-subfeatures* conditionalization