Replace FOLLY_HAVE_LINUX_MEMBARRIER_H with __has_include

Summary:
[Folly] Replace `FOLLY_HAVE_LINUX_MEMBARRIER_H` with `__has_include`.

Now that folly only targets which support `__has_include`.

Reviewed By: Orvid

Differential Revision: D9279852

fbshipit-source-id: 94c446a2d6e2662d32a7899ab470679da6da8e0e

CMake/FollyConfigChecks.cmake

@@ -9,7 +9,6 @@ include(CheckCXXCompilerFlag)
 CHECK_INCLUDE_FILE_CXX(malloc.h FOLLY_HAVE_MALLOC_H)
 CHECK_INCLUDE_FILE_CXX(bits/c++config.h FOLLY_HAVE_BITS_CXXCONFIG_H)
 CHECK_INCLUDE_FILE_CXX(features.h FOLLY_HAVE_FEATURES_H)
-CHECK_INCLUDE_FILE_CXX(linux/membarrier.h FOLLY_HAVE_LINUX_MEMBARRIER_H)
 CHECK_INCLUDE_FILE_CXX(jemalloc/jemalloc.h FOLLY_USE_JEMALLOC)
 
 if(NOT CMAKE_SYSTEM_NAME STREQUAL "Windows")

CMake/folly-config.h.cmake

@@ -38,7 +38,6 @@
 #cmakedefine FOLLY_HAVE_MALLOC_H 1
 #cmakedefine FOLLY_HAVE_BITS_CXXCONFIG_H 1
 #cmakedefine FOLLY_HAVE_FEATURES_H 1
-#cmakedefine FOLLY_HAVE_LINUX_MEMBARRIER_H 1
 #cmakedefine FOLLY_USE_JEMALLOC 1
 
 #if FOLLY_HAVE_FEATURES_H

folly/portability/SysMembarrier.cpp

@@ -27,7 +27,7 @@
 #if !defined(__NR_membarrier)
 #define __NR_membarrier 324
 #endif
-#if FOLLY_HAVE_LINUX_MEMBARRIER_H
+#if __has_include(<linux/membarrier.h>)
 #include <linux/membarrier.h> // @manual
 #else
 #define MEMBARRIER_CMD_QUERY 0