Merge to upstream r225300.

Change-Id: I2b23715db9ac129ff80aa78ad5824db0a4d6fbb3

test/std/containers/container.adaptors/stack/stack.ops/eq.pass.cpp

@@ -0,0 +1,40 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <stack>
+
+// template <class T, class Container>
+//   bool operator==(const stack<T, Container>& x,const stack<T, Container>& y);
+//
+// template <class T, class Container>
+//   bool operator!=(const stack<T, Container>& x,const stack<T, Container>& y);
+
+#include <stack>
+#include <cassert>
+
+template <class C>
+C
+make(int n)
+{
+    C c;
+    for (int i = 0; i < n; ++i)
+        c.push(i);
+    return c;
+}
+
+int main()
+{
+    std::stack<int> q1 = make<std::stack<int> >(5);
+    std::stack<int> q2 = make<std::stack<int> >(10);
+    std::stack<int> q1_save = q1;
+    std::stack<int> q2_save = q2;
+    assert(q1 == q1_save);
+    assert(q1 != q2);
+    assert(q2 == q2_save);
+}

test/std/containers/container.adaptors/stack/stack.ops/lt.pass.cpp

@@ -0,0 +1,45 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <stack>
+
+// template <class T, class Container>
+//   bool operator< (const stack<T, Container>& x,const stack<T, Container>& y);
+//
+// template <class T, class Container>
+//   bool operator> (const stack<T, Container>& x,const stack<T, Container>& y);
+//
+// template <class T, class Container>
+//   bool operator>=(const stack<T, Container>& x,const stack<T, Container>& y);
+//
+// template <class T, class Container>
+//   bool operator<=(const stack<T, Container>& x,const stack<T, Container>& y);
+
+#include <stack>
+#include <cassert>
+
+template <class C>
+C
+make(int n)
+{
+    C c;
+    for (int i = 0; i < n; ++i)
+        c.push(i);
+    return c;
+}
+
+int main()
+{
+    std::stack<int> q1 = make<std::stack<int> >(5);
+    std::stack<int> q2 = make<std::stack<int> >(10);
+    assert(q1 < q2);
+    assert(q2 > q1);
+    assert(q1 <= q2);
+    assert(q2 >= q1);
+}