Remove remaining uses of null's absolute address from non-IA32.

runtime/vm/intrinsifier_mips.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 40 matching lines @@
   Label fall_through;
 
   if (Isolate::Current()->flags().type_checks()) {
     const intptr_t type_args_field_offset =
         ComputeObjectArrayTypeArgumentsOffset();
     // Inline simple tests (Smi, null), fallthrough if not positive.
     Label checked_ok;
     __ lw(T2, Address(SP, 0 * kWordSize));  // Value.
 
     // Null value is valid for any type.
-    __ LoadImmediate(T7, reinterpret_cast<int32_t>(Object::null()));
+    __ LoadObject(T7, Object::null_object());
     __ beq(T2, T7, &checked_ok);
 
     __ lw(T1, Address(SP, 2 * kWordSize));  // Array.
     __ lw(T1, FieldAddress(T1, type_args_field_offset));
 
     // T1: Type arguments of array.
     __ beq(T1, T7, &checked_ok);
 
     // Check if it's dynamic.
     // Get type at index 0.
@@ skipping 90 matching lines @@
   // len = len + 1;
   __ addiu(T3, T1, Immediate(value_one));
   __ sw(T3, FieldAddress(T0, GrowableObjectArray::length_offset()));
   __ lw(T0, Address(SP, 0 * kWordSize));  // Value.
   ASSERT(kSmiTagShift == 1);
   __ sll(T1, T1, 1);
   __ addu(T1, T2, T1);
   __ StoreIntoObject(T2,
                      FieldAddress(T1, Array::data_offset()),
                      T0);
-  __ LoadImmediate(T7, reinterpret_cast<int32_t>(Object::null()));
+  __ LoadObject(T7, Object::null_object());
   __ Ret();
   __ delay_slot()->mov(V0, T7);
   __ Bind(&fall_through);
 }
 
 
 #define TYPED_ARRAY_ALLOCATION(type_name, cid, max_len, scale_shift)           \
   Label fall_through;                                                          \
   const intptr_t kArrayLengthStackOffset = 0 * kWordSize;                      \
   __ MaybeTraceAllocation(cid, T2, &fall_through,                              \
@@ skipping 1975 matching lines @@
 
 void Intrinsifier::Profiler_getCurrentTag(Assembler* assembler) {
   __ LoadIsolate(V0);
   __ Ret();
   __ delay_slot()->lw(V0, Address(V0, Isolate::current_tag_offset()));
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS