[PATCH] RISC-V: Add tuple types support
From: Juzhe-Zhong gcc/ChangeLog: * config/riscv/riscv-modes.def (RVV_TUPLE_MODES): New macro. (RVV_TUPLE_PARTIAL_MODES): Ditto. * config/riscv/riscv-protos.h (riscv_v_ext_tuple_mode_p): New function. (get_nf): Ditto. (get_subpart_mode): Ditto
