Attribute arena allocations previously marked as STL.

Bug: 28603175
Change-Id: I488e39b23afb86f3ff5a2df16d2df59eb3adaa0f
diff --git a/compiler/optimizing/ssa_phi_elimination.cc b/compiler/optimizing/ssa_phi_elimination.cc
index 0978ae1..44bcadf 100644
--- a/compiler/optimizing/ssa_phi_elimination.cc
+++ b/compiler/optimizing/ssa_phi_elimination.cc
@@ -30,7 +30,7 @@
   // Phis are constructed live and should not be revived if previously marked
   // dead. This algorithm temporarily breaks that invariant but we DCHECK that
   // only phis which were initially live are revived.
-  ArenaSet<HPhi*> initially_live(graph_->GetArena()->Adapter());
+  ArenaSet<HPhi*> initially_live(graph_->GetArena()->Adapter(kArenaAllocSsaPhiElimination));
 
   // Add to the worklist phis referenced by non-phi instructions.
   for (HReversePostOrderIterator it(*graph_); !it.Done(); it.Advance()) {
@@ -127,8 +127,9 @@
     }
   }
 
-  ArenaSet<uint32_t> visited_phis_in_cycle(graph_->GetArena()->Adapter());
-  ArenaVector<HPhi*> cycle_worklist(graph_->GetArena()->Adapter());
+  ArenaSet<uint32_t> visited_phis_in_cycle(
+      graph_->GetArena()->Adapter(kArenaAllocSsaPhiElimination));
+  ArenaVector<HPhi*> cycle_worklist(graph_->GetArena()->Adapter(kArenaAllocSsaPhiElimination));
 
   while (!worklist_.empty()) {
     HPhi* phi = worklist_.back();