improve portability to avoid conflicting with std::next in c++'0x.
Patch by Howard Hinnant!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90365 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86COFFMachineModuleInfo.h b/lib/Target/X86/X86COFFMachineModuleInfo.h
index afd5525..1bd31b8 100644
--- a/lib/Target/X86/X86COFFMachineModuleInfo.h
+++ b/lib/Target/X86/X86COFFMachineModuleInfo.h
@@ -16,6 +16,7 @@
 
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/ADT/StringSet.h"
+#include "X86MachinefunctionInfo.h"
 
 namespace llvm {
   class X86MachineFunctionInfo;