MIPS: Track heap objects.

src/mips/lithium-mips.cc

Index: src/mips/lithium-mips.cc
diff --git a/src/mips/lithium-mips.cc b/src/mips/lithium-mips.cc
index 7142bc1423ab86b01681ab8b358f380b720195bf..b5c47ef859317aee52b457b00b55ceeef6fee598 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -2209,7 +2209,9 @@ LInstruction* LChunkBuilder::DoStoreNamedField(HStoreNamedField* instr) {
   LOperand* temp = needs_write_barrier_for_map ? TempRegister() : NULL;
 
   LStoreNamedField* result = new(zone()) LStoreNamedField(obj, val, temp);
-  if (FLAG_track_fields && instr->field_representation().IsSmi()) {
+  if ((FLAG_track_fields && instr->field_representation().IsSmi()) ||
+      (FLAG_track_heap_object_fields &&
+       instr->field_representation().IsHeapObject())) {
     return AssignEnvironment(result);
   }
   return result;