AArch64: Improve rotate patterns

Improve and generalize rotate patterns. Rotates by more than half the
bitwidth of a register are canonicalized to rotate left. Many existing
shift patterns don't handle this case correctly, so add rotate left to
the shift iterator and convert rotate left into ror during assembly
output. Add missing zero_extend patterns for shifted BIC, ORN and EON.

gcc/
	* config/aarch64/aarch64.md
	(and_<SHIFT:optab><mode>3_compare0): Support rotate left.
	(and_<SHIFT:optab>si3_compare0_uxtw): Likewise.
	(<LOGICAL:optab>_<SHIFT:optab><mode>3): Likewise.
	(<LOGICAL:optab>_<SHIFT:optab>si3_uxtw): Likewise.
	(one_cmpl_<optab><mode>2): Likewise.
	(<LOGICAL:optab>_one_cmpl_<SHIFT:optab><mode>3): Likewise.
	(<LOGICAL:optab>_one_cmpl_<SHIFT:optab>sidi_uxtw): New pattern.
	(eor_one_cmpl_<SHIFT:optab><mode>3_alt): Support rotate left.
	(eor_one_cmpl_<SHIFT:optab>sidi3_alt_ze): Likewise.
	(and_one_cmpl_<SHIFT:optab><mode>3_compare0): Likewise.
	(and_one_cmpl_<SHIFT:optab>si3_compare0_uxtw): Likewise.
	(and_one_cmpl_<SHIFT:optab><mode>3_compare0_no_reuse): Likewise.
	(and_<SHIFT:optab><mode>3nr_compare0): Likewise.
	(*<optab>si3_insn_uxtw): Use SHIFT_no_rotate.
	(rolsi3_insn_uxtw): New pattern.
	* config/aarch64/iterators.md (SHIFT): Add rotate left.
	(SHIFT_no_rotate): Add new iterator.
	(SHIFT:shift): Print rotate left as ror.
	(is_rotl): Add test for left rotate.

gcc/testsuite/
	* gcc.target/aarch64/ror_2.c: New test.
	* gcc.target/aarch64/ror_3.c: New test.