method specializer used to confuse permuation vector optimization.
* bug fix: system inserted bogus implicit type declarations for local
special variables in DEFMETHOD bodies.
+ * bug fix: #354; duplicated frames in backtraces due to
+ non-tail-call-optimized XEPs to functions with return type NIL
+ have been elimited.
changes in sbcl-1.0.23 relative to 1.0.22:
* enhancement: when disassembling method functions, disassembly