[CS] Avoid solver-allocated inputs with `typesSatisfyConstraint`
Escaping solver-allocated types into a nested allocation arena is
problematic since we can e.g lazily compute the `ContextSubMap` for a
`NominalOrBoundGenericNominalType`, which is then destroyed when we
exit the nested arena. Ensure we don't pass any types with type
variables or placeholders to `typesSatisfyConstraint`.
rdar://152763265
