changes in sbcl-1.4.6 relative to sbcl-1.4.5:
* enhancement: DISASSEMBLE on a symbol naming a macro will disassemble
the expander, not the code that traps attempted FUNCALL of the macro.
* enhancement: The sb-sprof contrib now provides an experimental interface
for accessing collected profiler data.
* enhancement: The instruction-level profiling of the sb-prof contrib
annotates the disassembler output more efficiently.
* optimization: improved dynamic-extent handling of nested variables.