[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

Summary:
This patch improves how libc++ handles min/max macros within the headers. Previously libc++ would undef them and emit a warning.
This patch changes libc++ to use `#pragma push_macro`  to save the macro before undefining it, and `#pragma pop_macro` to restore the macros and the end of the header.

Reviewers: mclow.lists, bcraig, compnerd, EricWF

Reviewed By: EricWF

Subscribers: cfe-commits, krytarowski

Differential Revision: https://reviews.llvm.org/D33080

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@304357 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/shared_mutex b/include/shared_mutex
index ff36ee6..9cb8152 100644
--- a/include/shared_mutex
+++ b/include/shared_mutex
@@ -125,12 +125,14 @@
 
 #include <__config>
 
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+
 #if _LIBCPP_STD_VER > 11 || defined(_LIBCPP_BUILDING_SHARED_MUTEX)
 
 #include <__mutex_base>
 
-#include <__undef_min_max>
-
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif
@@ -500,4 +502,6 @@
 
 #endif  // _LIBCPP_STD_VER > 11
 
+_LIBCPP_POP_MACROS
+
 #endif  // _LIBCPP_SHARED_MUTEX