Move folly/detail/Sleeper.h to folly/synchronization/detail/

Summary: [Folly] Move `folly/detail/Sleeper.h` to `folly/synchronization/detail/`.

Reviewed By: Orvid

Differential Revision: D6636459

fbshipit-source-id: e0b37459fe721c96837b653e652c1bc6bfeb5dce

folly/Makefile.am

@@ -80,7 +80,6 @@ nobase_follyinclude_HEADERS = \
 	detail/PolyDetail.h \
 	detail/RangeCommon.h \
 	detail/RangeSse42.h \
-	detail/Sleeper.h \
 	detail/SlowFingerprint.h \
 	detail/SocketFastOpen.h \
 	detail/StaticSingletonManager.h \
@@ -440,6 +439,7 @@ nobase_follyinclude_HEADERS = \
 	synchronization/CallOnce.h \
 	synchronization/LifoSem.h \
 	synchronization/detail/AtomicUtils.h \
+	synchronization/detail/Sleeper.h \
 	system/MemoryMapping.h \
 	system/Shell.h \
 	system/ThreadId.h \

folly/MicroSpinLock.h

@@ -45,8 +45,8 @@
 #include <type_traits>
 
 #include <folly/Portability.h>
-#include <folly/detail/Sleeper.h>
 #include <folly/lang/Align.h>
+#include <folly/synchronization/detail/Sleeper.h>
 
 namespace folly {
 

folly/PicoSpinLock.h

@@ -48,7 +48,7 @@
 #include <glog/logging.h>
 
 #include <folly/Portability.h>
-#include <folly/detail/Sleeper.h>
+#include <folly/synchronization/detail/Sleeper.h>
 
 #if !FOLLY_X64 && !FOLLY_AARCH64 && !FOLLY_PPC64
 #error "PicoSpinLock.h is currently x64, aarch64 and ppc64 only."