RISC-V: Fix typos in code

RISC-V: Fix typos in code

This fixes typos in function names and executed code.

gcc/ChangeLog:

	* config/riscv/riscv-target-attr.cc (num_occurences_in_str): Rename...
	(num_occurrences_in_str): here.
	(riscv_process_target_attr): Update num_occurences_in_str callsite.
	* config/riscv/riscv-v.cc (emit_vec_widden_cvt_x_f): widden -> widen.
	(emit_vec_widen_cvt_x_f): Ditto.
	(emit_vec_widden_cvt_f_f): Ditto.
	(emit_vec_widen_cvt_f_f): Ditto.
	(emit_vec_rounding_to_integer): Update *widden* callsites.
	* config/riscv/riscv-vector-builtins.cc (expand_builtin): Update
	required_ext_to_isa_name callsite and fix xtheadvector typo.
	* config/riscv/riscv-vector-builtins.h (reqired_ext_to_isa_name): Rename...
	(required_ext_to_isa_name): here.
	* config/riscv/riscv_th_vector.h: Fix endif label.
	* config/riscv/vector-crypto.md: boardcast_scalar -> broadcast_scalar.
	* config/riscv/vector.md: Ditto.

Signed-off-by: Patrick O'Neill <patrick@rivosinc.com>