Avoid HeapObject check in HStoreNamedField.

src/arm64/lithium-arm64.cc

Index: src/arm64/lithium-arm64.cc
diff --git a/src/arm64/lithium-arm64.cc b/src/arm64/lithium-arm64.cc
index 50e0f44cfefac8cdd185a552dfc5e8f5711bf2cd..f434e466cd25e45a7d16ce2b89cccd232bcd87f2 100644
--- a/src/arm64/lithium-arm64.cc
+++ b/src/arm64/lithium-arm64.cc
@@ -2399,13 +2399,7 @@ LInstruction* LChunkBuilder::DoStoreNamedField(HStoreNamedField* instr) {
     temp0 = TempRegister();
   }
 
-  LStoreNamedField* result =
-      new(zone()) LStoreNamedField(object, value, temp0, temp1);
-  if (instr->field_representation().IsHeapObject() &&
-      !instr->value()->type().IsHeapObject()) {
-    return AssignEnvironment(result);
-  }
-  return result;
+  return new(zone()) LStoreNamedField(object, value, temp0, temp1);
 }