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 a506a18001c51f2d005955b2ccdfc039afaea430..11e4d397d86f135a22cc7f8c5cf42f2a449bc568 100644
--- a/runtime/vm/flow_graph_builder.cc
+++ b/runtime/vm/flow_graph_builder.cc
@@ -2394,7 +2394,7 @@ void EffectGraphVisitor::VisitArrayNode(ArrayNode* node) {
       const intptr_t index_scale = Instance::ElementSizeFor(class_id);
       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, kAlignedAccess, deopt_id, node->token_pos());
       Do(store);
     }
     ReturnDefinition(ExitTempLocalScope(array_val));