changes in sbcl-1.4.10 relative to sbcl-1.4.9:
* enhancement: added SB-EXT:MAKE-WEAK-VECTOR.
* enhancement: constant-modification detection warnings can be generated
in the presence of conditional constructs.
* optimization: better bounds-checking on x86[-64] and ARM64.
* optimization: adding 1 to or subtracting 1 from a fixnum variable does not
cons.
* bug fixes: fix a number of bugs revealed by random testing (lp#1782826,
lp#1779878, lp#1779737)