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 0aff92bde22c049fe019ecf25664c11b8a31faf7..1c2edebd78c9c91613b9fa99e4ecbbe3caa5227f 100644
--- a/runtime/vm/kernel_to_il.cc
+++ b/runtime/vm/kernel_to_il.cc
@@ -2349,10 +2349,11 @@ Fragment FlowGraphBuilder::StoreIndexed(intptr_t class_id) {
   Value* index = Pop();
   // TODO(27590): Omit store barrier when possible (e.g., storing
   // some constants).
+  bool aligned = true;
   StoreIndexedInstr* store = new (Z) StoreIndexedInstr(
       Pop(),  // Array.
       index, value, kEmitStoreBarrier, Instance::ElementSizeFor(class_id),
-      class_id, Thread::kNoDeoptId, TokenPosition::kNoSource);
+      class_id, aligned, Thread::kNoDeoptId, TokenPosition::kNoSource);
   Push(store);
   return Fragment(store);
 }