AArch64: Support C/C++ operations on svbool_t

AArch64: Support C/C++ operations on svbool_t

Support a subset of C/C++ operations (bitwise, conditional etc.) on svbool_t.

gcc/c-family/ChangeLog:

	* c-common.cc (c_build_vec_convert): Support vector boolean
	types for __builtin_convertvector ().

gcc/c/ChangeLog:

	* c-typeck.cc (build_binary_op): Support vector boolean types.

gcc/cp/ChangeLog:

	* typeck.cc (cp_build_binary_op): Likewise.
	* call.cc (build_conditional_expr): Support vector booleans.
	* cvt.cc (ocp_convert): Call target hook to resolve conversion
	between standard and non-standard booleans.

gcc/ChangeLog:

	* config/aarch64/aarch64-sve-builtins.cc (register_builtin_types): Make
	SVE vector boolean type equivalent to GNU vectors.
	* config/aarch64/aarch64-sve.md (extend<vpred><mode>2,
	zero_extend<vpred><mode>2, trunc<mode><vpred>2, vec_cmp<mode><mode>):
	New patterns to support additional operations on predicate modes.
	* config/aarch64/aarch64.cc (aarch64_valid_vector_boolean_op): New.
	(aarch64_invalid_unary_op): Consider vector bool types.
	(aarch64_invalid_binary_op): Likewise.
	(aarch64_convert_to_type): Define target hook and handle standard to
	non-standard bool conversion.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/sve/acle/general/cops_bool.c: New.