Fix string conversions functions to throw out_of_range properly. Fixes http://llvm.org/bugs/show_bug.cgi?id=14919.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@172447 91177308-0d34-0410-b5e6-96231b3b80d8

test/strings/string.conversions/stoll.pass.cpp

@@ -86,4 +86,13 @@ int main()
     {
         assert(idx == 0);
     }
+    try
+    {
+        std::stoll("99999999999999999999999999", &idx);
+        assert(false);
+    }
+    catch (const std::out_of_range&)
+    {
+        assert(idx == 0);
+    }
 }