Merge pull request swiftlang#27079 from compnerd/r-value-ref

ClangImporter: repair build on Windows

Author: compnerd

lib/ClangImporter/ImportDecl.cpp

@@ -4550,7 +4550,7 @@ namespace {
       Impl.SwiftContext.evaluator.cacheOutput(ExtendedTypeRequest{result},
                                               objcClass->getDeclaredType());
       Impl.SwiftContext.evaluator.cacheOutput(ExtendedNominalRequest{result},
-                                              objcClass);
+                                              std::move(objcClass));
 
       // Determine the type and generic args of the extension.
       if (objcClass->getGenericParams()) {