LoongArch: Simplify using bstr{ins,pick} instructions for and

For bstrins, we can merge it into and<mode>3 instead of having a
separate define_insn.

For bstrpick, we can use the constraints to ensure the first source
register and the destination register are the same hardware register,
instead of emitting a move manually.

This will simplify the next commit where we'll reassociate bitwise
and left shift for better code generation.

gcc/ChangeLog:

	* config/loongarch/constraints.md (Yy): New define_constriant.
	* config/loongarch/loongarch.cc (loongarch_print_operand):
	For "%M", output the index of bits to be used with
	bstrins/bstrpick.
	* config/loongarch/predicates.md (ins_zero_bitmask_operand):
	Exclude low_bitmask_operand as for low_bitmask_operand it's
	always better to use bstrpick instead of bstrins.
	(and_operand): New define_predicate.
	* config/loongarch/loongarch.md (any_or): New
	define_code_iterator.
	(bitwise_operand): New define_code_attr.
	(*<optab:any_or><mode:GPR>3): New define_insn.
	(*and<mode:GPR>3): New define_insn.
	(<optab:any_bitwise><mode:X>3): New define_expand.
	(and<mode>3_extended): Remove, replaced by the 3rd alternative
	of *and<mode:GPR>3.
	(bstrins_<mode>_for_mask): Remove, replaced by the 4th
	alternative of *and<mode:GPR>3.
	(*<optab:any_bitwise>si3_internal): Remove, already covered by
	the *<optab:any_or><mode:GPR>3 and *and<mode:GPR>3 templates.

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