Merged r13420 into 3.12 branch.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 38e75b5dc474b4c86c12a38fe263e4f014263a19..117fa1b4199bae6c586f3cc18a92e8db1223942e 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -3818,7 +3818,7 @@ void LCodeGen::DoTransitionElementsKind(LTransitionElementsKind* instr) {
   __ Branch(&not_applicable, ne, scratch, Operand(from_map));
 
   __ li(new_map_reg, Operand(to_map));
-  if (IsFastSmiElementsKind(from_kind) && IsFastObjectElementsKind(to_kind)) {
+  if (IsSimpleMapChangeTransition(from_kind, to_kind)) {
     __ sw(new_map_reg, FieldMemOperand(object_reg, HeapObject::kMapOffset));
     // Write barrier.
     __ RecordWriteField(object_reg, HeapObject::kMapOffset, new_map_reg,