Index: lib/Target/ARM/ARMConstantPoolValue.h
===================================================================
--- lib/Target/ARM/ARMConstantPoolValue.h	(revision 105933)
+++ lib/Target/ARM/ARMConstantPoolValue.h	(working copy)
@@ -15,6 +15,7 @@
 #define LLVM_TARGET_ARM_CONSTANTPOOLVALUE_H
 
 #include "llvm/CodeGen/MachineConstantPool.h"
+#include <cstddef>
 
 namespace llvm {
 
