Support unaligned integer loads on ARM and MIPS.

runtime/vm/flow_graph_builder.cc

Index: runtime/vm/flow_graph_builder.cc
diff --git a/runtime/vm/flow_graph_builder.cc b/runtime/vm/flow_graph_builder.cc
index d6871ae0d0249aa4315c1f259833a014c8b3c537..fd61e335ceaad67f7addc9a91a8f13e7e9c624c8 100644
--- a/runtime/vm/flow_graph_builder.cc
+++ b/runtime/vm/flow_graph_builder.cc
@@ -2392,9 +2392,10 @@ void EffectGraphVisitor::VisitArrayNode(ArrayNode* node) {
               ? kNoStoreBarrier
               : kEmitStoreBarrier;
       const intptr_t index_scale = Instance::ElementSizeFor(class_id);
+      const bool aligned = true;
       StoreIndexedInstr* store = new(Z) StoreIndexedInstr(
           array, index, for_value.value(), emit_store_barrier,
-          index_scale, class_id, deopt_id, node->token_pos());
+          index_scale, class_id, aligned, deopt_id, node->token_pos());
       Do(store);
     }
     ReturnDefinition(ExitTempLocalScope(array_val));