MIPS: Replace LoadNamedFieldPolymorphic with explicit branches.

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 fa415e5ef2b9313a4bd9d24cbbe7a391ba9439a3..8a9079ce8ac0003267819aac6d45bbf21bfe55d9 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -2067,23 +2067,6 @@ LInstruction* LChunkBuilder::DoLoadNamedField(HLoadNamedField* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoLoadNamedFieldPolymorphic(
-    HLoadNamedFieldPolymorphic* instr) {
-  ASSERT(instr->representation().IsTagged());
-  if (instr->need_generic()) {
-    LOperand* obj = UseFixed(instr->object(), a0);
-    LLoadNamedFieldPolymorphic* result =
-        new(zone()) LLoadNamedFieldPolymorphic(obj);
-    return MarkAsCall(DefineFixed(result, v0), instr);
-  } else {
-    LOperand* obj = UseRegisterAtStart(instr->object());
-    LLoadNamedFieldPolymorphic* result =
-        new(zone()) LLoadNamedFieldPolymorphic(obj);
-    return AssignEnvironment(DefineAsRegister(result));
-  }
-}
-
-
 LInstruction* LChunkBuilder::DoLoadNamedGeneric(HLoadNamedGeneric* instr) {
   LOperand* object = UseFixed(instr->object(), a0);
   LInstruction* result = DefineFixed(new(zone()) LLoadNamedGeneric(object), v0);