Walter Brown sent a list of tests which needed 'additional includes' to match what was in the standard. Added these includes to the tests. No changes to the library or test results.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@225541 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/strings/basic.string/string.nonmembers/string_op+/char_string.pass.cpp

@@ -18,6 +18,7 @@
 //   operator+(charT lhs, basic_string<charT,traits,Allocator>&& rhs);
 
 #include <string>
+#include <utility>
 #include <cassert>
 
 #include "min_allocator.h"

test/std/strings/basic.string/string.nonmembers/string_op+/pointer_string.pass.cpp

@@ -18,6 +18,7 @@
 //   operator+(const charT* lhs, basic_string<charT,traits,Allocator>&& rhs);
 
 #include <string>
+#include <utility>
 #include <cassert>
 
 #include "min_allocator.h"

test/std/strings/basic.string/string.nonmembers/string_op+/string_char.pass.cpp

@@ -18,6 +18,7 @@
 //   operator+(basic_string<charT,traits,Allocator>&& lhs, charT rhs);
 
 #include <string>
+#include <utility>
 #include <cassert>
 
 #include "min_allocator.h"

test/std/strings/basic.string/string.nonmembers/string_op+/string_pointer.pass.cpp

@@ -18,6 +18,7 @@
 //   operator+(basic_string<charT,traits,Allocator>&& lhs, const charT* rhs);
 
 #include <string>
+#include <utility>
 #include <cassert>
 
 #include "min_allocator.h"

test/std/strings/basic.string/string.nonmembers/string_op+/string_string.pass.cpp

@@ -30,6 +30,7 @@
 //             const basic_string<charT,traits,Allocator>&& rhs);
 
 #include <string>
+#include <utility>
 #include <cassert>
 
 #include "min_allocator.h"