MIPS: Track heap objects.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index a4e40a6a8dd3f843388b5ae88ebaae60e6af873a..d94f40e299dd47cbb312dee087f90c0cb18958ab 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -3911,6 +3911,12 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
     if (!instr->hydrogen()->value()->range()->IsInSmiRange()) {
       DeoptimizeIf(lt, instr->environment(), scratch, Operand(zero_reg));
     }
+  } else if (FLAG_track_heap_object_fields && representation.IsHeapObject()) {
+    Register value = ToRegister(instr->value());
+    if (!instr->hydrogen()->value()->type().IsHeapObject()) {
+      __ And(scratch, value, Operand(kSmiTagMask));
+      DeoptimizeIf(eq, instr->environment(), scratch, Operand(zero_reg));
+    }
   } else if (FLAG_track_double_fields && representation.IsDouble()) {
     ASSERT(transition.is_null());
     ASSERT(instr->is_in_object());