* Mitigate possible speed 3 miss-optimization

* Mitigate possible speed 3 miss-optimization

Do not perform trampoline optimization at speed 3 on function if their
name is not unique inside the compilation unit.  Note that the
function can still be redefined in any other way therefore this is a
mitigation.

	* lisp/emacs-lisp/comp.el (comp-func-unique-in-cu-p): New
	predicate.
	(comp-call-optim-form-call): Perform trampoline optimization
	for named functions only if they are unique within the current
	compilation unit.