[NFC] AST: Clean up unused field and parameter in LocalArchetypeType subclasses

Author: AnthonyLatsis

include/swift/AST/Types.h

@@ -6976,8 +6976,6 @@ class OpenedArchetypeType final : public LocalArchetypeType,
   friend ArchetypeType;
   friend GenericEnvironment;
 
-  UUID ID;
-
   /// Create a new opened archetype in the given environment representing
   /// the interface type.
   ///
@@ -6993,10 +6991,7 @@ class OpenedArchetypeType final : public LocalArchetypeType,
   /// of an existential value.
   ///
   /// \param existential The existential type to open.
-  /// \param knownID When non-empty, the known ID of the archetype. When empty,
-  /// a fresh archetype with a unique ID will be opened.
-  static CanTypeWrapper<OpenedArchetypeType>
-  get(CanType existential, std::optional<UUID> knownID = std::nullopt);
+  static CanTypeWrapper<OpenedArchetypeType> get(CanType existential);
 
   /// Create a new archetype that represents the opened type
   /// of an existential value.
@@ -7071,8 +7066,6 @@ class ElementArchetypeType final : public LocalArchetypeType,
   friend ArchetypeType;
   friend GenericEnvironment;
 
-  UUID ID;
-
   /// Create a new element archetype in the given environment representing
   /// the interface type.
   ///

lib/AST/ASTContext.cpp

@@ -5561,19 +5561,13 @@ CanTypeWrapper<OpenedArchetypeType> OpenedArchetypeType::getNew(
       properties));
 }
 
-CanOpenedArchetypeType OpenedArchetypeType::get(CanType existential,
-                                                std::optional<UUID> knownID) {
+CanOpenedArchetypeType OpenedArchetypeType::get(CanType existential) {
   auto &ctx = existential->getASTContext();
   auto existentialSig = ctx.getOpenedExistentialSignature(existential);
 
-  if (!knownID)
-    knownID = UUID::fromTime();
-
   auto *genericEnv = GenericEnvironment::forOpenedExistential(
-      existentialSig.OpenedSig,
-      existentialSig.Shape,
-      existentialSig.Generalization,
-      *knownID);
+      existentialSig.OpenedSig, existentialSig.Shape,
+      existentialSig.Generalization, UUID::fromTime());
 
   return cast<OpenedArchetypeType>(
     genericEnv->mapTypeIntoContext(existentialSig.SelfType)