fix up the problem in model_profiling when fed 'Modulelist'

[13015517713]

Problem Introduction:
  Module.register_forward_hook function adds hooks to each module (with forward function) without ModuleList. So ModuleList module does not record the profile including macs and params. When traversing deep-first module.children fcuntion does not calculate the profile when this module is a instance of ModuleList.

Problem Reproduction:
  You can try to modify "self.blocks" in model.py to the instance of ModuleList.

def __init__(self):
  self.blocks = nn.ModuleList()
def forward(self, x):
  for block in self.blocks:
    x = block(x)

Solution:
  I handle ModuleList specially, recording to each non-ModuleList submodule.