Hi,

I've been looking at types of Relay pass recently and got a bit confused when 
it comes to `MixedModeMutator` and when it should be used over `ExprRewriter`. 
The RFC 
(https://discuss.tvm.apache.org/t/performing-relay-passes-non-recursively/5696) 
seems to me to suggest that `ExprRewriter` should be used when wanting to 
mutate a graph non-recursively, yet I can see many uses of `MixedModeMutator` 
in the codebase for seemingly a similar reason. Therefore, I'm wondering 
if/what the difference is between `MixedModeMutator` and `ExprRewriter`, and 
when one should be used over the other?

cc @mbrookhart @tqchen @manupa-arm





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