Recognize popcount also when a double width operation is needed.

Recognize popcount also when a double width operation is needed.

2021-05-28  Joern Rennecke  <joern.rennecke@riscy-ip.com>
gcc/
	* match.pd <popcount & / + pattern matching>:
	When generating popcount directly fails, try doing it in two halves.
gcc/testsuite/
	* gcc.dg/tree-ssa/popcount4ll.c: Remove lp64 condition.
	Adjust scanning pattern for !lp64.
	* gcc.dg/tree-ssa/popcount5ll.c: Likewise.
	* gcc.dg/tree-ssa/popcount4l.c: Adjust scanning pattern
	for ! int32plus.

Co-Authored-By: Richard Biener  <rguenther@suse.de>