RISC-V: Add vlm/vsm C/C++ API intrinsics support

RISC-V: Add vlm/vsm C/C++ API intrinsics support

gcc/ChangeLog:

	* config/riscv/riscv-vector-builtins-bases.cc (BASE): Add vlm/vsm support.
	* config/riscv/riscv-vector-builtins-bases.h: Ditto.
	* config/riscv/riscv-vector-builtins-functions.def (vlm): New define.
	(vsm): Ditto.
	* config/riscv/riscv-vector-builtins-shapes.cc (struct loadstore_def): Add vlm/vsm support.
	* config/riscv/riscv-vector-builtins-types.def (DEF_RVV_B_OPS): Ditto.
	(vbool64_t): Ditto.
	(vbool32_t): Ditto.
	(vbool16_t): Ditto.
	(vbool8_t): Ditto.
	(vbool4_t): Ditto.
	(vbool2_t): Ditto.
	(vbool1_t): Ditto.
	* config/riscv/riscv-vector-builtins.cc (DEF_RVV_B_OPS): Ditto.
	(rvv_arg_type_info::get_tree_type): Ditto.
	(function_expander::use_contiguous_load_insn): Ditto.
	* config/riscv/vector.md (@pred_store<mode>): Ditto.

gcc/testsuite/ChangeLog:

	* g++.target/riscv/rvv/base/vsm-1.C: New test.
	* g++.target/riscv/rvv/rvv.exp: New test.
	* gcc.target/riscv/rvv/base/vlm_vsm-1.c: New test.
	* gcc.target/riscv/rvv/base/vlm_vsm-2.c: New test.
	* gcc.target/riscv/rvv/base/vlm_vsm-3.c: New test.