changes in sbcl-1.0.56 relative to sbcl-1.0.55:
* bug fix: fix copy-structure. When copying from stack to heap, garbage
could end up in the heap making GC unhappy.
(Thanks to James Knight, lp#911027)
* enhancements
** SBCL can now be built using Clang.
** ASDF has been updated 2.20.
* bug fix: compiler errors when weakening hairy integer types. (lp#913232)
* bug fix: don't complain about a too-hairy lexical environment for inlining
when the function has never been requested for inlining. (lp#963530)