When deducing an argument against a type that is `<facet value> as type`
we don't care about the `as type` part of that expression. We want to
find an argument that can convert to the `FacetType` of the facet value
for the generic binding that is the `<facet value>`.
This was done after-the-fact in the Deduce switch, but we move this
canonicalization step to be more explicit and done up front at the start
of the Deduce loop. This:
- Avoids a trip through the Deduce loop for a `FacetAccessType`
parameter, just to deduce through it in the switch, which avoids convert
and creation of extraneous constant values.
- Uses the `GetCanonicalFacetOrTypeValue()` function so that when we add
`SymbolicBindingType` handling to that function it will apply to Deduce
as well correctly, instead of needing to handle both in the switch.
Dana Jansens
b99bc00632