c++: variadic lambda noexcept-specifier [PR99583]

The tree-walk looking for parameter packs didn't find this one because we
weren't stepping into TYPE_RAISES_EXCEPTIONS.

gcc/cp/ChangeLog:

	PR c++/99583
	PR c++/99584
	* tree.c (cp_walk_subtrees) [FUNCTION_TYPE]: Walk into
	TYPE_RAISES_EXCEPTIONS.

gcc/testsuite/ChangeLog:

	PR c++/99583
	* g++.dg/cpp0x/lambda/lambda-variadic12.C: New test.

gcc/cp/tree.c

@@ -5415,6 +5415,11 @@ cp_walk_subtrees (tree *tp, int *walk_subtrees_p, walk_tree_fn func,
 	}
       break;
 
+    case FUNCTION_TYPE:
+    case METHOD_TYPE:
+      WALK_SUBTREE (TYPE_RAISES_EXCEPTIONS (*tp));
+      break;
+
     default:
       return NULL_TREE;
     }

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-variadic12.C

@@ -0,0 +1,9 @@
+// PR c++/99583
+// { dg-do compile { target c++11 } }
+
+void f(...);
+
+template <bool... B>
+void g() {
+ f([]() noexcept(B) {} ...);
+}