Done rely on C++ object padding across platforms

src/deoptimizer.h

Index: src/deoptimizer.h
===================================================================
--- src/deoptimizer.h	(revision 7362)
+++ src/deoptimizer.h	(working copy)
@@ -326,7 +326,9 @@
                    JSFunction* function);
 
   void* operator new(size_t size, uint32_t frame_size) {
-    return malloc(size + frame_size);
+    // Subtracts kPointerSize, as the member frame_content_ already supplies
+    // the first element of the area to store the frame.
+    return malloc(size + frame_size - kPointerSize);
   }
 
   void operator delete(void* description) {
@@ -410,7 +412,7 @@
   }
 
   static int frame_content_offset() {
-    return sizeof(FrameDescription);
+    return OFFSET_OF(FrameDescription, frame_content_);
   }
 
  private:
@@ -429,6 +431,10 @@
   // deoptimizing.
   intptr_t continuation_;
 
+  // This must be at the end of the object as the object is allocated larger
+  // than it's definition indicate to extend this array.
+  intptr_t frame_content_[1];
+
   intptr_t* GetFrameSlotPointer(unsigned offset) {
     ASSERT(offset < frame_size_);
     return reinterpret_cast<intptr_t*>(