[Tool] --show-dialects, --list-passes needed to take input

[ita9naiwa]

ASIS:
iree-opt --show-dialects, and iree-opt --list-passes requires dummy input, if it's not given, it expects to read input from stdin.

TOBE:
it directly works without passing dummy input.

> iree-opt --show-dialects

Available Dialects: affine,amdgpu,arith,arm_neon,arm_sme,arm_sve,bufferization,builtin,cf,check,chlo,complex,emitc,flow,func,gpu,hal,hal_inline,hal_loader,io_parameters,iree_codegen,iree_cpu,iree_encoding,iree_gpu,iree_input,iree_linalg_ext,iree_vector_ext,linalg,llvm,math,memref,mesh,ml_program,nvgpu,nvvm,pdl,pdl_interp,quant,rocdl,scf,shape,spirv,stablehlo,stream,tensor,tm_tensor,torch,torch_c,tosa,transform,util,vector,vhlo,vm,vmvx