The value register in storefield(smi) is not used as a temp

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 6b910233bcb63e98e9bbe49e306c613f46a0e461..904ffa56dddcf390f0a1dbf9cf0382c242e8d055 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -2311,7 +2311,7 @@ LInstruction* LChunkBuilder::DoStoreNamedField(HStoreNamedField* instr) {
   }
 
   LOperand* val;
-  if (needs_write_barrier || instr->field_representation().IsSmi()) {
+  if (needs_write_barrier) {
     val = UseTempRegister(instr->value());
   } else if (instr->field_representation().IsDouble()) {
     val = UseRegisterAtStart(instr->value());