Remove legacy EVRP code.

Remove legacy EVRP code.

With DOM converted to ranger, there are no longer any uses of the EVRP
engine.  For that matter, we haven't used the legacy mode in quite a
while, so I think it's safe to remove any associated code.

There are some methods in vr_values which should now be private, but I
didn't bother changing them, as most of the vr_values class will be
removed when VRP1 is converted to ranger.

Tested on x86-64 Linux.

gcc/ChangeLog:

	* Makefile.in: Remove gimple-ssa-evrp.o and gimple-ssa-evrp-analyze.o.
	* flag-types.h (enum evrp_mode): Remove.
	* params.opt: Remove --param=evrp-mode.
	* tree-vrp.cc (make_pass_early_vrp): New.
	(pass_vrp::execute): Call early VRP instance.
	* gimple-ssa-evrp-analyze.cc: Removed.
	* gimple-ssa-evrp-analyze.h: Removed.
	* gimple-ssa-evrp.cc: Removed.

gcc/testsuite/ChangeLog:

	* g++.dg/pr100774.C: Remove --param=evrp-mode.
	* gcc.dg/pr100781.c: Same.