[nvptx] Add shf.{l,r}.wrap insn

[nvptx] Add shf.{l,r}.wrap insn

Ptx contains funnel shift operations shf.l.wrap and shf.r.wrap that can be
used to implement 32-bit left or right rotate.

Add define_insns rotlsi3 and rotrsi3.

Tested on nvptx.

gcc/ChangeLog:

2022-02-23  Tom de Vries  <tdevries@suse.de>

	* config/nvptx/nvptx.md (define_insn "rotlsi3", define_insn
	"rotrsi3"): New define_insn.

gcc/testsuite/ChangeLog:

2022-02-23  Tom de Vries  <tdevries@suse.de>

	* gcc.target/nvptx/rotate-run.c: New test.
	* gcc.target/nvptx/rotate.c: New test.