Retain the order of parameters while generating ConcreteModuleTypes (#34131)
Summary:
`ConcreteModuleTypeBuilder` used to keep parameters together with all others attributes in an `unordered_map` often leading to reordering them while building up the type. Parameter order is semantically meaningful, so we need to preserve it.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34131
Differential Revision: D20331542
Pulled By: suo
fbshipit-source-id: 5b860025f7902654d6099751d3fb14b12f6f5a67
