Migrate loadFingerprint onto ModuleDecl and Friends

lib/Serialization/SerializedModuleLoader.cpp

@@ -1215,6 +1215,11 @@ void SerializedASTFile::lookupObjCMethods(
   File.lookupObjCMethods(selector, results);
 }
 
+Optional<Fingerprint>
+SerializedASTFile::loadFingerprint(const IterableDeclContext *IDC) const {
+  return File.loadFingerprint(IDC);
+}
+
 void SerializedASTFile::lookupImportedSPIGroups(
                         const ModuleDecl *importedModule,
                         llvm::SmallSetVector<Identifier, 4> &spiGroups) const {