Fix tests that fail without PCH

The recent change to stop transitively including <string> broke some
tests, but only when the library is configured without PCH, because
otherwise the <string> header still gets included via the precompiled
<bits/stdc++.h> header.

	* testsuite/20_util/bad_function_call/what.cc: Include <string> header
	for std::string.
	* testsuite/20_util/shared_ptr/cons/weak_ptr_expired.cc: Likewise.
	* testsuite/20_util/tuple/cons/allocator_with_any.cc: Include <memory>
	header for std::allocator.
	* testsuite/23_containers/array/tuple_interface/tuple_element.cc: Add
	using-declaration for std::size_t.
	* testsuite/23_containers/array/tuple_interface/tuple_size.cc:
	Likewise.
	* testsuite/23_containers/deque/cons/55977.cc: Include <istream> for
	std::istream.
	* testsuite/23_containers/vector/cons/55977.cc: Likewise.
	* testsuite/experimental/map/erasure.cc: Include <string> for
	std::string.
	* testsuite/experimental/unordered_map/erasure.cc: Likewise.

From-SVN: r272376

libstdc++-v3/ChangeLog

+2019-06-17  Jonathan Wakely  <jwakely@redhat.com>
+
+	* testsuite/20_util/bad_function_call/what.cc: Include <string> header
+	for std::string.
+	* testsuite/20_util/shared_ptr/cons/weak_ptr_expired.cc: Likewise.
+	* testsuite/20_util/tuple/cons/allocator_with_any.cc: Include <memory>
+	header for std::allocator.
+	* testsuite/23_containers/array/tuple_interface/tuple_element.cc: Add
+	using-declaration for std::size_t.
+	* testsuite/23_containers/array/tuple_interface/tuple_size.cc:
+	Likewise.
+	* testsuite/23_containers/deque/cons/55977.cc: Include <istream> for
+	std::istream.
+	* testsuite/23_containers/vector/cons/55977.cc: Likewise.
+	* testsuite/experimental/map/erasure.cc: Include <string> for
+	std::string.
+	* testsuite/experimental/unordered_map/erasure.cc: Likewise.
+
 2019-06-14  Jonathan Wakely  <jwakely@redhat.com>
 
 	* include/experimental/type_traits (experimental::nonesuch): Use

libstdc++-v3/testsuite/20_util/bad_function_call/what.cc

@@ -18,6 +18,7 @@
 // <http://www.gnu.org/licenses/>.
 
 #include <functional>
+#include <string>
 #include <testsuite_hooks.h>
 
 int main()

libstdc++-v3/testsuite/20_util/shared_ptr/cons/weak_ptr_expired.cc

@@ -20,6 +20,7 @@
 // 20.6.6.2 Template class shared_ptr [util.smartptr.shared]
 
 #include <memory>
+#include <string>
 #include <testsuite_hooks.h>
 
 struct A { };

libstdc++-v3/testsuite/20_util/tuple/cons/allocator_with_any.cc

@@ -23,6 +23,7 @@
 // this test may begin to fail.
 
 #include <tuple>
+#include <memory>
 #include <experimental/any>
 #include <testsuite_hooks.h>
 

libstdc++-v3/testsuite/23_containers/array/tuple_interface/tuple_element.cc

@@ -29,7 +29,7 @@ test01()
   // This relies on the fact that <utility> includes <type_traits>:
   using std::is_same;
 
-  const size_t len = 3;
+  const std::size_t len = 3;
   typedef array<int, len> array_type;
 
   static_assert(is_same<tuple_element<0, array_type>::type, int>::value, "" );

libstdc++-v3/testsuite/23_containers/array/tuple_interface/tuple_size.cc

@@ -26,6 +26,7 @@ test01()
 {
   using std::array;
   using std::tuple_size;
+  using std::size_t;
   // This relies on the fact that <utility> includes <type_traits>:
   using std::is_same;
 

libstdc++-v3/testsuite/23_containers/deque/cons/55977.cc

@@ -21,6 +21,7 @@
 #include <utility>
 #include <deque>
 #include <iterator>
+#include <istream>
 
 template <class T>
 struct MyAllocator

libstdc++-v3/testsuite/23_containers/vector/cons/55977.cc

@@ -21,6 +21,7 @@
 #include <utility>
 #include <vector>
 #include <iterator>
+#include <istream>
 
 template <class T>
 struct MyAllocator

libstdc++-v3/testsuite/experimental/map/erasure.cc

@@ -18,6 +18,7 @@
 // <http://www.gnu.org/licenses/>.
 
 #include <experimental/map>
+#include <string>
 #include <testsuite_hooks.h>
 
 auto is_odd_pair = [](const std::pair<const int, std::string>& p)

libstdc++-v3/testsuite/experimental/unordered_map/erasure.cc

@@ -18,6 +18,7 @@
 // <http://www.gnu.org/licenses/>.
 
 #include <experimental/unordered_map>
+#include <string>
 #include <testsuite_hooks.h>
 
 auto is_odd_pair = [](const std::pair<const int, std::string>& p)