Make offsets to inner allocated objects aligned in allocation folding.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index e7ad219964b3946b35e81dbd76011d7e8ff2133f..7f07ed59fffa02d02bbb4e2bcaa6cd9fb7220be7 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -3495,11 +3495,18 @@ void HAllocate::HandleSideEffectDominator(GVNFlag side_effect,
   dominator_allocate->clear_next_map_word_ = clear_next_map_word_;
 
   // After that replace the dominated allocate instruction.
+  HInstruction* inner_offset = HConstant::CreateAndInsertBefore(
+      zone,
+      context(),
+      dominator_size_constant,
+      Representation::None(),
+      this);
+
   HInstruction* dominated_allocate_instr =
       HInnerAllocatedObject::New(zone,
                                  context(),
                                  dominator_allocate,
-                                 dominator_size,
+                                 inner_offset,
                                  type());
   dominated_allocate_instr->InsertBefore(this);
   DeleteAndReplaceWith(dominated_allocate_instr);