Promoting elements transitions to their own field.

src/mips/macro-assembler-mips.cc

Index: src/mips/macro-assembler-mips.cc
diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index 6cd5e97f62a61252299cbddd4755dff7e8fedccb..14b73082fc8038bb7ebd38920f5de0d41ce799d8 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -3481,7 +3481,7 @@ void MacroAssembler::CompareMapAndBranch(Register obj,
       Map* current_map = *map;
       while (CanTransitionToMoreGeneralFastElementsKind(kind, packed)) {
         kind = GetNextMoreGeneralFastElementsKind(kind, packed);
-        current_map = current_map->LookupElementsTransitionMap(kind, NULL);
+        current_map = current_map->LookupElementsTransitionMap(kind);
         if (!current_map) break;
         Branch(early_success, eq, scratch, right);
         right = Operand(Handle<Map>(current_map));