Add #include

llvm-svn: 11285
diff --git a/llvm/lib/Target/X86/PeepholeOptimizer.cpp b/llvm/lib/Target/X86/PeepholeOptimizer.cpp
index 6650837..59ebb15 100644
--- a/llvm/lib/Target/X86/PeepholeOptimizer.cpp
+++ b/llvm/lib/Target/X86/PeepholeOptimizer.cpp
@@ -14,6 +14,7 @@
 #include "X86.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/Target/MRegisterInfo.h"
 #include "Support/Statistic.h"
 using namespace llvm;