[NFC] TypeResolution: Add a 'forInterface' factory constructor that takes a generic environment

Author: AnthonyLatsis

lib/Sema/TypeCheckType.cpp

@@ -72,8 +72,18 @@ TypeResolution
 TypeResolution::forInterface(DeclContext *dc, TypeResolutionOptions options,
                              OpenUnboundGenericTypeFn unboundTyOpener,
                              HandlePlaceholderTypeReprFn placeholderHandler) {
+  return forInterface(dc, dc->getGenericEnvironmentOfContext(), options,
+                      unboundTyOpener, placeholderHandler);
+}
+
+TypeResolution
+TypeResolution::forInterface(DeclContext *dc, GenericEnvironment *genericEnv,
+                             TypeResolutionOptions options,
+                             OpenUnboundGenericTypeFn unboundTyOpener,
+                             HandlePlaceholderTypeReprFn placeholderHandler) {
   TypeResolution result(dc, TypeResolutionStage::Interface, options,
                         unboundTyOpener, placeholderHandler);
+  result.genericEnv = genericEnv;
   return result;
 }
 

lib/Sema/TypeCheckType.h

@@ -328,6 +328,14 @@ class TypeResolution {
                OpenUnboundGenericTypeFn unboundTyOpener,
                HandlePlaceholderTypeReprFn placeholderHandler);
 
+  /// Form a type resolution for an interface type, which is a complete
+  /// description of the type using generic parameters.
+  static TypeResolution
+  forInterface(DeclContext *dc, GenericEnvironment *genericEnv,
+               TypeResolutionOptions opts,
+               OpenUnboundGenericTypeFn unboundTyOpener,
+               HandlePlaceholderTypeReprFn placeholderHandler);
+
   /// Form a type resolution for a contextual type, which is a complete
   /// description of the type using the archetypes of the given declaration
   /// context.