Fix two test failures in <experimental/filesystem>

First, <experimental/filesystem> didn't correctly guard
against min/max macros. This adds the proper push/pop macro guards.

Second, an internal time helper had been renamed but the test for
it hadn't been updated. This patch updates those tests.

llvm-svn: 337520
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 3bf90e7811188701cfad18f091956bea4853ec51
diff --git a/include/experimental/filesystem b/include/experimental/filesystem
index 6481aa6..2d2c117 100644
--- a/include/experimental/filesystem
+++ b/include/experimental/filesystem
@@ -251,6 +251,9 @@
 #pragma GCC system_header
 #endif
 
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
 #define __cpp_lib_experimental_filesystem 201406
 
 _LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL_FILESYSTEM
@@ -2647,4 +2650,6 @@
 
 _LIBCPP_END_NAMESPACE_EXPERIMENTAL_FILESYSTEM
 
+_LIBCPP_POP_MACROS
+
 #endif // _LIBCPP_EXPERIMENTAL_FILESYSTEM
diff --git a/test/libcxx/experimental/filesystem/convert_file_time.sh.cpp b/test/libcxx/experimental/filesystem/convert_file_time.sh.cpp
index e418851..cc1696c 100644
--- a/test/libcxx/experimental/filesystem/convert_file_time.sh.cpp
+++ b/test/libcxx/experimental/filesystem/convert_file_time.sh.cpp
@@ -28,7 +28,7 @@
 using namespace std::chrono;
 namespace fs = std::experimental::filesystem;
 using fs::file_time_type;
-using fs::detail::fs_time_util;
+using fs::detail::time_util::fs_time_util;
 
 enum TestKind { TK_64Bit, TK_32Bit, TK_FloatingPoint };