Robustify PROCESS-TYPE-DECL
Improve error message when loading FASLs with undefined packages.

Include the symbol name when loading a FASL with a symbol from an
undefined package.
Fix call_into_lisp on x86-64, reviewed by foom (jyknight)
Tweak VECTOR-SAP on x86-64
Fix pprinter bug reported by Didier Verna
Improve CURRENT-THREAD-OFFSET-SAP on x86-64
Show progress during (LOAD "f.fasl" :PRINT T)