Add new shrpsi instruction variands to gcc/config/pa/pa.md.

Add new shrpsi instruction variands to gcc/config/pa/pa.md.

2020-09-12  Roger Sayle  <roger@nextmovesoftware.com>
	    John David Anglin  <danglin@gcc.gnu.org>

gcc/ChangeLog
	* config/pa/pa.md (shrpsi4_1, shrpsi4_2): New define_insns split
	out from previous shrpsi4 providing two commutitive variants using
	plus_xor_ior_operator as a predicate.
	(shrpdi4_1, shrpdi4_2, shrpdi_3, shrpdi_4): Likewise DImode versions
	where _1 and _2 take register shifts, and _3 and _4 for integers.
	(rotlsi3_internal): Name this anonymous instruction.
	(rotrdi3): New DImode insn copied from rotrsi3.
	(rotldi3): New DImode expander copied from rotlsi3.
	(rotldi4_internal): New DImode insn copied from rotsi3_internal.