Remove uses of llvm/System/IncludeFile.h that are no longer needed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50695 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/System/Alarm.h

@@ -17,8 +17,6 @@
 #ifndef LLVM_SYSTEM_ALARM_H
 #define LLVM_SYSTEM_ALARM_H
 
-#include "llvm/System/IncludeFile.h"
-
 namespace llvm {
 namespace sys {
 
@@ -44,6 +42,4 @@ namespace sys {
 } // End sys namespace
 } // End llvm namespace
 
-FORCE_DEFINING_FILE_TO_BE_LINKED(SystemAlarm)
-
 #endif