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

src/deoptimizer.h

Index: src/deoptimizer.h
diff --git a/src/deoptimizer.h b/src/deoptimizer.h
index 0ee61856f24c53a564ac1dff3fb049a0ac037df3..3cf70466c0c126b291dff7d081700f2312428782 100644
--- a/src/deoptimizer.h
+++ b/src/deoptimizer.h
@@ -212,6 +212,11 @@ class Deoptimizer : public Malloced {
     return OFFSET_OF(Deoptimizer, output_count_);
   }
   static int output_offset() { return OFFSET_OF(Deoptimizer, output_); }
+  static int frame_alignment_marker_offset() {
+    return OFFSET_OF(Deoptimizer, frame_alignment_marker_); }
+  static int has_alignment_padding_offset() {
+    return OFFSET_OF(Deoptimizer, has_alignment_padding_);
+  }
 
   static int GetDeoptimizedCodeCount(Isolate* isolate);
 
@@ -316,6 +321,10 @@ class Deoptimizer : public Malloced {
   // Array of output frame descriptions.
   FrameDescription** output_;
 
+  // Frames can be dynamically padded on ia32 to align untagged doubles.
+  Object* frame_alignment_marker_;
+  intptr_t has_alignment_padding_;
+
   List<HeapNumberMaterializationDescriptor> deferred_heap_numbers_;
 
   static const int table_entry_size_;