0.8.0.35:
Compiler depessimization, (part IV of XL :-)
... let's see what happens if we're a little less demure about
putting derived function types into the globaldb. We don't
actually use them unless SB-EXT:*DERIVE-FUNCTION-TYPES* is true,
so this shouldn't make a difference to the compiler in normal
circumstances (though it does when the compiler is being built,
and also can do for libraries who choose to use the extension)
This is probably a staging post on the way to ANSI-style
optimization of file-compilation, wherein we can treat all the
functions in one file as tightly coupled (see CLHS 3.2.2.3)