Don't treat '=' as simple equality emitting constraints (bug#46812)

Don't treat '=' as simple equality emitting constraints (bug#46812)

Extend assumes allowing the following form

(assume dst (= src1 src2))

to caputure '=' semanting during fwprop handling float integer
conversions.

	* lisp/emacs-lisp/comp.el (comp-equality-fun-p): Don't treat '=' as
	simple equality.
	(comp-arithm-cmp-fun-p, comp-negate-arithm-cmp-fun)
	(comp-reverse-arithm-fun): Rename and add '=' '!='.
	(comp-emit-assume, comp-add-cond-cstrs, comp-fwprop-insn): Update
	for new function nameing and to handle '='.
	* lisp/emacs-lisp/comp-cstr.el (comp-cstr-=): New function.
	* test/src/comp-tests.el (comp-tests-type-spec-tests): Add a bunch
	of '=' specific tests.