swift

b4c3a212 - [ast] Convert swift::getBuiltinType to use a covered switch for BuiltinTypeKind.

[ast] Convert swift::getBuiltinType to use a covered switch for BuiltinTypeKind. This is an NFC change. The idea is that this will make it easier to add new BuiltinTypeKinds. I missed this code when adding Builtin.ImplicitIsolationActor. By adding a covered switch, we can make sure this code is updated in the future. (cherry picked from commit 05536d7183de6dfd55b445c92e63313d3aa25a2b)