Support unaligned integer loads on ARM and MIPS.

runtime/vm/kernel_to_il.cc

Index: runtime/vm/kernel_to_il.cc
diff --git a/runtime/vm/kernel_to_il.cc b/runtime/vm/kernel_to_il.cc
index e5bf5ae5da44bbd5bbf1464de139639857d4cffe..230d82cffdc7e5399cde23ccfe8904d617d3ca29 100644
--- a/runtime/vm/kernel_to_il.cc
+++ b/runtime/vm/kernel_to_il.cc
@@ -2352,7 +2352,7 @@ Fragment FlowGraphBuilder::StoreIndexed(intptr_t class_id) {
   StoreIndexedInstr* store = new (Z) StoreIndexedInstr(
       Pop(),  // Array.
       index, value, kEmitStoreBarrier, Instance::ElementSizeFor(class_id),
-      class_id, Thread::kNoDeoptId, TokenPosition::kNoSource);
+      class_id, kAlignedAccess, Thread::kNoDeoptId, TokenPosition::kNoSource);
   Push(store);
   return Fragment(store);
 }