Hybrid Inter-function call wrong

[chengchen]

@yzh119

Hi @chengchen , would you mind elaborating more on the benefits of supporting this feature? (e.g. in what case inter-function call would simplify op definition)?

i hope to provide builtin tensor operation based on tir like tvm/python/tvm/topi/math.py. In buitin tensor operation, it can be programed as tir script as well and therefore can be scheduled.