[clang][NFC] Mark CWG 974 and 1814 (default argument in a...

...lambda-expression) as done. They have been allowed since at least clang 3.3.

clang/test/CXX/drs/dr18xx.cpp

@@ -31,6 +31,14 @@ namespace dr1813 { // dr1813: 7
   static_assert(!__is_standard_layout(U), "");
 }
 
+namespace dr1814 { // dr1814: yes
+#if __cplusplus >= 201103L
+  void test() {
+    auto lam = [](int x = 42) { return x; };
+  }
+#endif
+}
+
 namespace dr1815 { // dr1815: no
 #if __cplusplus >= 201402L
   // FIXME: needs codegen test

clang/test/CXX/drs/dr9xx.cpp

@@ -73,3 +73,11 @@ namespace dr948 { // dr948: 3.7
   }
 #endif
 }
+
+namespace dr974 { // dr974: yes
+#if __cplusplus >= 201103L
+  void test() {
+    auto lam = [](int x = 42) { return x; };
+  }
+#endif
+}