Store transition on HStoreNamedField as HConstant.

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 a5371f7d67334fffd712fd6ac672e1b842709a10..f981f579e744b8549fc0f7e14e93f2a5bf7e63ba 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -2245,7 +2245,7 @@ LInstruction* LChunkBuilder::DoTrapAllocationMemento(
 LInstruction* LChunkBuilder::DoStoreNamedField(HStoreNamedField* instr) {
   bool is_in_object = instr->access().IsInobject();
   bool needs_write_barrier = instr->NeedsWriteBarrier();
-  bool needs_write_barrier_for_map = !instr->transition().is_null() &&
+  bool needs_write_barrier_for_map = instr->has_transition() &&
       instr->NeedsWriteBarrierForMap();
 
   LOperand* obj;