MIPS: Use movw/movt instead of constant pool on ARMv7.

src/mips/assembler-mips.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 556 matching lines @@
   uint32_t jump_address(Label* L);
 
   // Puts a labels target address at the given position.
   // The high 8 bits are set to zero.
   void label_at_put(Label* L, int at_offset);
 
   // Read/Modify the code target address in the branch/call instruction at pc.
   static Address target_address_at(Address pc);
   static void set_target_address_at(Address pc, Address target);
 
+  // Return the code target address at a call site from the return address
+  // of that call in the instruction stream.
+  inline static Address target_address_from_return_address(Address pc);
+
   static void JumpLabelToJumpRegister(Address pc);
 
   static void QuietNaN(HeapObject* nan);
 
   // This sets the branch destination (which gets loaded at the call address).
   // This is for calls and branches within generated code.  The serializer
   // has already deserialized the lui/ori instructions etc.
   inline static void deserialization_set_special_target_at(
       Address instruction_payload, Address target) {
     set_target_address_at(
@@ skipping 40 matching lines @@
   static const int kPatchReturnSequenceAddressOffset = 0;
 
   // Distance between start of patched debug break slot and the emitted address
   // to jump to.
   static const int kPatchDebugBreakSlotAddressOffset =  0 * kInstrSize;
 
   // Difference between address of current opcode and value read from pc
   // register.
   static const int kPcLoadDelta = 4;
 
+  static const int kPatchDebugBreakSlotReturnOffset = 4 * kInstrSize;
+
   // Number of instructions used for the JS return sequence. The constant is
   // used by the debugger to patch the JS return sequence.
   static const int kJSReturnSequenceInstructions = 7;
   static const int kDebugBreakSlotInstructions = 4;
   static const int kDebugBreakSlotLength =
       kDebugBreakSlotInstructions * kInstrSize;
 
 
   // ---------------------------------------------------------------------------
   // Code generation.
@@ skipping 641 matching lines @@
 class EnsureSpace BASE_EMBEDDED {
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_MIPS_H_