swift

54521bd2 - AST: Canonicalize opaque archetype substitution maps in the solver arena

AST: Canonicalize opaque archetype substitution maps in the solver arena Preserving sugar if we have type variables uses way too much memory. Canonicalize these substitution maps for now, as a (temporary?) workaround. In the future, if we decide preserving sugar is more important than a few dozen Mb of memory usage, we can also bump the arena memory limit, instead. Fixes rdar://166237860. Fixes rdar://165863647.