Move substitute_and_fold over to use simple_dce_from_worklist

Move substitute_and_fold over to use simple_dce_from_worklist

While looking into a different issue, I noticed that it
would take until the second forwprop pass to do some
forward proping and it was because the ssa name was
used more than once but the second statement was
"dead" and we don't remove that until much later.

So this uses simple_dce_from_worklist instead of manually
removing of the known unused statements instead.
Propagate engine does not do a cleanupcfg afterwards either but manually
cleans up possible EH edges so simple_dce_from_worklist
needs to communicate that back to the propagate engine.

Some testcases needed to be updated/changed even because of better optimization.
gcc.dg/pr81192.c even had to be changed to be using the gimple FE so it would
be less fragile in the future too.
gcc.dg/tree-ssa/pr98737-1.c was failing because __atomic_fetch_ was being matched
but in those cases, the result was not being used so both __atomic_fetch_ and
__atomic_x_and_fetch_ are valid choices and would not make a code generation difference.
evrp7.c, evrp8.c, vrp35.c, vrp36.c: just needed a slightly change as the removal message
is different slightly.
kernels-alias-8.c: ccp1 is able to remove an unused load which causes ealias to have
one less load to analysis so update the expected scan #.

OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

gcc/ChangeLog:

	PR tree-optimization/109691
	* tree-ssa-dce.cc (simple_dce_from_worklist): Add need_eh_cleanup
	argument.
	If the removed statement can throw, have need_eh_cleanup
	include the bb of that statement.
	* tree-ssa-dce.h (simple_dce_from_worklist): Update declaration.
	* tree-ssa-propagate.cc (struct prop_stats_d): Remove
	num_dce.
	(substitute_and_fold_dom_walker::substitute_and_fold_dom_walker):
	Initialize dceworklist instead of stmts_to_remove.
	(substitute_and_fold_dom_walker::~substitute_and_fold_dom_walker):
	Destore dceworklist instead of stmts_to_remove.
	(substitute_and_fold_dom_walker::before_dom_children):
	Set dceworklist instead of adding to stmts_to_remove.
	(substitute_and_fold_engine::substitute_and_fold):
	Call simple_dce_from_worklist instead of poping
	from the list.
	Don't update the stat on removal statements.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/evrp7.c: Update for output change.
	* gcc.dg/tree-ssa/evrp8.c: Likewise.
	* gcc.dg/tree-ssa/vrp35.c: Likewise.
	* gcc.dg/tree-ssa/vrp36.c: Likewise.
	* gcc.dg/tree-ssa/pr98737-1.c: Update scan-tree-dump-not
	to check for assignment too instead of just a call.
	* c-c++-common/goacc/kernels-alias-8.c: Update test
	for removal of load.
	* gcc.dg/pr81192.c: Rewrite testcase in gimple based test.