Add tests for LWG#2299. While doing so, I noticed that the tests we have for the transparent comparators don't actually call them. Fix those tests, too. Now one of them is failing, due to a missing const in <map>. Add that (twice). Next step is to do the same for <unordered_map>

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@241091 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/containers/associative/map/map.ops/lower_bound.pass.cpp

@@ -19,6 +19,7 @@
 
 #include "min_allocator.h"
 #include "private_constructor.hpp"
+#include "is_transparent.h"
 
 int main()
 {
@@ -280,6 +281,41 @@ int main()
     assert(r == next(m.begin(), 7));
     r = m.lower_bound(20);
     assert(r == next(m.begin(), 8));
+
+    r = m.lower_bound(C2Int(5));
+    assert(r == m.begin());
+    r = m.lower_bound(C2Int(7));
+    assert(r == next(m.begin()));
+    r = m.lower_bound(C2Int(9));
+    assert(r == next(m.begin(), 2));
+    r = m.lower_bound(C2Int(11));
+    assert(r == next(m.begin(), 3));
+    r = m.lower_bound(C2Int(13));
+    assert(r == next(m.begin(), 4));
+    r = m.lower_bound(C2Int(15));
+    assert(r == next(m.begin(), 5));
+    r = m.lower_bound(C2Int(17));
+    assert(r == next(m.begin(), 6));
+    r = m.lower_bound(C2Int(19));
+    assert(r == next(m.begin(), 7));
+    r = m.lower_bound(C2Int(4));
+    assert(r == next(m.begin(), 0));
+    r = m.lower_bound(C2Int(6));
+    assert(r == next(m.begin(), 1));
+    r = m.lower_bound(C2Int(8));
+    assert(r == next(m.begin(), 2));
+    r = m.lower_bound(C2Int(10));
+    assert(r == next(m.begin(), 3));
+    r = m.lower_bound(C2Int(12));
+    assert(r == next(m.begin(), 4));
+    r = m.lower_bound(C2Int(14));
+    assert(r == next(m.begin(), 5));
+    r = m.lower_bound(C2Int(16));
+    assert(r == next(m.begin(), 6));
+    r = m.lower_bound(C2Int(18));
+    assert(r == next(m.begin(), 7));
+    r = m.lower_bound(C2Int(20));
+    assert(r == next(m.begin(), 8));
     }
     
     {