ARM: Fix generating two ldr instructions in place of ldrd....

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 62 matching lines @@
   bool is(Register reg) const  { return code_ == reg.code_; }
   int code() const  {
     ASSERT(is_valid());
     return code_;
   }
   int bit() const  {
     ASSERT(is_valid());
     return 1 << code_;
   }
 
+  void set_code(int code) {
+    code_ = code;
+    ASSERT(is_valid());
+  }
+
   // Unfortunately we can't make this private in a struct.
   int code_;
 };
 
 const Register no_reg = { -1 };
 
 const Register r0  = {  0 };
 const Register r1  = {  1 };
 const Register r2  = {  2 };
 const Register r3  = {  3 };
@@ skipping 358 matching lines @@
   void set_offset(int32_t offset) {
       ASSERT(rm_.is(no_reg));
       offset_ = offset;
   }
 
   uint32_t offset() {
       ASSERT(rm_.is(no_reg));
       return offset_;
   }
 
-  Register rm() const {return rm_;}
+  Register rn() const { return rn_; }
+  Register rm() const { return rm_; }
 
  private:
   Register rn_;  // base
   Register rm_;  // register offset
   int32_t offset_;  // valid if rm_ == no_reg
   ShiftOp shift_op_;
   int shift_imm_;  // valid if rm_ != no_reg && rs_ == no_reg
   AddrMode am_;  // bits P, U, and W
 
   friend class Assembler;
@@ skipping 662 matching lines @@
 
   friend class RegExpMacroAssemblerARM;
   friend class RelocInfo;
   friend class CodePatcher;
   friend class BlockConstPoolScope;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_ARM_H_