Add movw and movt support for ARMv7. This includes some code from...

src/arm/constants-arm.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 266 matching lines @@
   inline int SField() const { return Bit(20); }
     // with register
   inline int RmField() const { return Bits(3, 0); }
   inline Shift ShiftField() const { return static_cast<Shift>(Bits(6, 5)); }
   inline int RegShiftField() const { return Bit(4); }
   inline int RsField() const { return Bits(11, 8); }
   inline int ShiftAmountField() const { return Bits(11, 7); }
     // with immediate
   inline int RotateField() const { return Bits(11, 8); }
   inline int Immed8Field() const { return Bits(7, 0); }
+  inline int Immed4Field() const { return Bits(19, 16); }
+  inline int ImmedMovwMovtField() const {
+      return Immed4Field() << 12 | Offset12Field(); }
 
   // Fields used in Load/Store instructions
   inline int PUField() const { return Bits(24, 23); }
   inline int  BField() const { return Bit(22); }
   inline int  WField() const { return Bit(21); }
   inline int  LField() const { return Bit(20); }
     // with register uses same fields as Data processing instructions above
     // with immediate
   inline int Offset12Field() const { return Bits(11, 0); }
     // multiple
@@ skipping 76 matching lines @@
   static int Number(const char* name, bool* is_double);
 
  private:
   static const char* names_[kNumVFPRegisters];
 };
 
 
 } }  // namespace assembler::arm
 
 #endif  // V8_ARM_CONSTANTS_ARM_H_