[Arm]: Make Assembler::movw only emit a movw instruction.

src/arm/assembler-arm.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 900 matching lines @@
            SBit s = LeaveCC, Condition cond = al);
   void mov(Register dst, Register src, SBit s = LeaveCC, Condition cond = al) {
     mov(dst, Operand(src), s, cond);
   }
 
   // Load the position of the label relative to the generated code object
   // pointer in a register.
   void mov_label_offset(Register dst, Label* label);
 
   // ARMv7 instructions for loading a 32 bit immediate in two instructions.
-  // This may actually emit a different mov instruction, but on an ARMv7 it
-  // is guaranteed to only emit one instruction.
+  // The constant for movw and movt should be in the range 0-0xffff.
   void movw(Register reg, uint32_t immediate, Condition cond = al);
-  // The constant for movt should be in the range 0-0xffff.
   void movt(Register reg, uint32_t immediate, Condition cond = al);
 
   void bic(Register dst, Register src1, const Operand& src2,
            SBit s = LeaveCC, Condition cond = al);
 
   void mvn(Register dst, const Operand& src,
            SBit s = LeaveCC, Condition cond = al);
 
   // Multiply instructions
 
@@ skipping 694 matching lines @@
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_ARM_H_