changes relative to sbcl-1.1.8:
* enchancement: disassemble now annotates some previously missing static
functions, like LENGTH.
+ * bug fix: problems with NCONC type derivation (reported by Jerry James).
* optimization: calls to static functions on x86-64 use less instructions.
* optimization: compute encode-universal-time at compile time when possible.
* optimization: when referencing internal functions as #'x, don't go through