Fixes for constant_prop_pass #2967
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Summary:
The constant_prop_pass didn't properly propagate constants when there were
simple primitives in the argument set. Extend it to see floats, ints, strings, etc.
as constant functions.
This allows this pass to fold additional things like quantize functions on weights.
Sometimes users don't want that, so allow them to use a lambda to skip
some nodes.
Differential Revision: D55942686