Correctify instanceof and make it optimizable.

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 6cd3410645e7af23d328a028977da85125987216..f9730c8e8e38718e9673dbb40d5fb12a9d60430c 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -933,22 +933,14 @@ void LChunkBuilder::AddInstruction(LInstruction* instr,
 
   if (instr->IsCall()) {
     HValue* hydrogen_value_for_lazy_bailout = hydrogen_val;
-    LInstruction* instruction_needing_environment = NULL;
     if (hydrogen_val->HasObservableSideEffects()) {
       HSimulate* sim = HSimulate::cast(hydrogen_val->next());
-      instruction_needing_environment = instr;
       sim->ReplayEnvironment(current_block_->last_environment());
       hydrogen_value_for_lazy_bailout = sim;
     }
     LInstruction* bailout = AssignEnvironment(new(zone()) LLazyBailout());
     bailout->set_hydrogen_value(hydrogen_value_for_lazy_bailout);
     chunk_->AddInstruction(bailout, current_block_);
-    if (instruction_needing_environment != NULL) {
-      // Store the lazy deopt environment with the instruction if needed.
-      // Right now it is only used for LInstanceOfKnownGlobal.
-      instruction_needing_environment->
-          SetDeferredLazyDeoptimizationEnvironment(bailout->environment());
-    }
   }
 }
 
@@ -999,22 +991,21 @@ LInstruction* LChunkBuilder::DoArgumentsElements(HArgumentsElements* elems) {
 
 
 LInstruction* LChunkBuilder::DoInstanceOf(HInstanceOf* instr) {
+  LOperand* left =
+      UseFixed(instr->left(), InstanceOfDescriptor::LeftRegister());
+  LOperand* right =
+      UseFixed(instr->right(), InstanceOfDescriptor::RightRegister());
   LOperand* context = UseFixed(instr->context(), cp);
-  LInstanceOf* result =
-      new(zone()) LInstanceOf(context, UseFixed(instr->left(), a0),
-                              UseFixed(instr->right(), a1));
+  LInstanceOf* result = new (zone()) LInstanceOf(context, left, right);
   return MarkAsCall(DefineFixed(result, v0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoInstanceOfKnownGlobal(
-    HInstanceOfKnownGlobal* instr) {
-  LInstanceOfKnownGlobal* result =
-      new(zone()) LInstanceOfKnownGlobal(
-          UseFixed(instr->context(), cp),
-          UseFixed(instr->left(), a0),
-          FixedTemp(t0));
-  return MarkAsCall(DefineFixed(result, v0), instr);
+LInstruction* LChunkBuilder::DoHasInPrototypeChainAndBranch(
+    HHasInPrototypeChainAndBranch* instr) {
+  LOperand* object = UseRegister(instr->object());
+  LOperand* prototype = UseRegister(instr->prototype());
+  return new (zone()) LHasInPrototypeChainAndBranch(object, prototype);
 }