Clean up ARM subtarget code by using Triple ADT.

llvm-svn: 123276
diff --git a/llvm/lib/Target/ARM/ARMFrameLowering.cpp b/llvm/lib/Target/ARM/ARMFrameLowering.cpp
index adff239..efffe06 100644
--- a/llvm/lib/Target/ARM/ARMFrameLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMFrameLowering.cpp
@@ -14,6 +14,7 @@
 #include "ARMFrameLowering.h"
 #include "ARMAddressingModes.h"
 #include "ARMBaseInstrInfo.h"
+#include "ARMBaseRegisterInfo.h"
 #include "ARMMachineFunctionInfo.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"