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When building the TypeRefinementContext subtree for a function declaration, postpone creation of the subtree if the function body is unparsed. This allows the compiler to completely avoid parsing function bodies that have been skipped (e.g. with -experimental-skip-non-inlinable-function-bodies) while still ensuring that the TRCs for functions are built lazily later if needed. When lazily generating SIL for a function with -experimental-lazy-typecheck, the TRCs must be built out while typechecking the function in order to emit correct diagnostics and SIL for `if #available` queries. Resolves rdar://117448323