Add dynamic stack frame alignment to optimized functions with untagged doubles on the stack.

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index 1ca1a7d4e75f3e0fc27db3de2d7ae6ff06705eb7..108b6d00ed166b9da2f6f6f623637f54cf00290a 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -2073,6 +2073,7 @@ class LChunk: public ZoneObject {
       graph_(graph),
       instructions_(32),
       pointer_maps_(8),
+      num_double_slots_(0),
       inlined_closures_(1) { }
 
   void AddInstruction(LInstruction* instruction, HBasicBlock* block);
@@ -2086,6 +2087,8 @@ class LChunk: public ZoneObject {
   int ParameterAt(int index);
   int GetParameterStackSlot(int index) const;
   int spill_slot_count() const { return spill_slot_count_; }
+  int num_double_slots() const { return num_double_slots_; }
+
   CompilationInfo* info() const { return info_; }
   HGraph* graph() const { return graph_; }
   const ZoneList<LInstruction*>* instructions() const { return &instructions_; }
@@ -2127,6 +2130,7 @@ class LChunk: public ZoneObject {
   HGraph* const graph_;
   ZoneList<LInstruction*> instructions_;
   ZoneList<LPointerMap*> pointer_maps_;
+  int num_double_slots_;
   ZoneList<Handle<JSFunction> > inlined_closures_;
 };