Support attributes when emitting function calls (#18156)

Support attributes when emitting function calls (#18156)

Summary:
The type of each `initial_ivalue` is completely known at some point but that information is discarded by the time a call to it is emitted. This PR is kind of a hack, as a better (longer) solution, the method should know about the type of each initial value.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18156

Differential Revision: D14525768

Pulled By: driazati

fbshipit-source-id: 52d53e9711a07a4551c988bd95fe997e654aa465