Add pragma system header to some experimental headers and add newlines to files.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@228712 91177308-0d34-0410-b5e6-96231b3b80d8

include/experimental/__config

@@ -13,6 +13,10 @@
 
 #include <__config>
 
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
 #define _LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL namespace std { namespace experimental {
 #define _LIBCPP_END_NAMESPACE_EXPERIMENTAL  } }
 #define _VSTD_EXPERIMENTAL std::experimental

include/experimental/chrono

@@ -37,6 +37,10 @@ inline namespace fundamentals_v1 {
 #include <experimental/__config>
 #include <chrono>
 
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
 #if _LIBCPP_STD_VER > 11
 
 _LIBCPP_BEGIN_NAMESPACE_CHRONO_LFTS

include/experimental/system_error

@@ -40,6 +40,10 @@ inline namespace fundamentals_v1 {
 
 #include <system_error>
 
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
 _LIBCPP_BEGIN_NAMESPACE_LFTS
 
 #if __has_feature(cxx_variable_templates)

include/experimental/type_traits

@@ -184,6 +184,10 @@ inline namespace fundamentals_v1 {
 
 #include <type_traits>
 
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
 _LIBCPP_BEGIN_NAMESPACE_LFTS
 
 #if __has_feature(cxx_variable_templates)

include/experimental/utility

@@ -31,9 +31,12 @@ inline namespace fundamentals_v1 {
 
  */
 
-# include <experimental/__config>
+#include <experimental/__config>
+#include <utility>
 
-# include <utility>
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
 
 _LIBCPP_BEGIN_NAMESPACE_LFTS