Disassemble: print the size into the right stream.

Print the newly introduced size information to the provided stream,
not to *standard-output*.
Reported by Jan Moringen.
Remove an unused VOP %make-symbol on x86-64.

%make-symbol is handled by define-primitive-object now.
The old VOP was copied into alloc.lisp during the x86_64 port, got
removed from x86 before the merge. It wasn't even ported to x86-64,
and was never invoked during the 9 years it has been sitting there.

Also remove fast_random_state variable from the C runtime, it was used
by the VOP.
Handle multiple-valued forms in TRACE :PRINT.

Closes: lp#457053.