changes in sbcl-2.1.9 relative to sbcl-2.1.8:
* minor incompatible change: the experimental DEFCAS macro has been removed.
* minor incompatible change: finalizing classes with slots with duplicate
symbol-names will only emit a warning if either slot name is an exported
symbol. (lp#1943559)
* platform support:
** the debugger is better able to display SIMD packs. (thanks to Marco
Heisig)
** fix a bug in zeroing YMM registers. (thanks to Marco Heisig)
** fix instruction definitions for SSE blend and shuffle vector
instructions. (thanks to Marco Heisig)
** handle heap corruption exceptions in our exception handler on win64.
** improve WAIT-UNTIL-FD-USABLE on Windows, reducing busy-looping.
(thanks to Fabio Almeida)
* bug fix: EQUALP hash tables whose keys contain arrays containing floats should
behave correctly. (lp#1942424, reported by Nicolas Neuss)