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

src/heap.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2226 matching lines @@
   set_false_value(obj);
 
   { MaybeObject* maybe_obj = CreateOddball("hole",
                                            Smi::FromInt(-1),
                                            Oddball::kTheHole);
     if (!maybe_obj->ToObject(&obj)) return false;
   }
   set_the_hole_value(obj);
 
   { MaybeObject* maybe_obj = CreateOddball("arguments_marker",
-                                           Smi::FromInt(-4),
+                                           Smi::FromInt(-2),
                                            Oddball::kArgumentMarker);
     if (!maybe_obj->ToObject(&obj)) return false;
   }
   set_arguments_marker(obj);
 
   { MaybeObject* maybe_obj = CreateOddball("no_interceptor_result_sentinel",
-                                           Smi::FromInt(-2),
+                                           Smi::FromInt(-3),
                                            Oddball::kOther);
     if (!maybe_obj->ToObject(&obj)) return false;
   }
   set_no_interceptor_result_sentinel(obj);
 
   { MaybeObject* maybe_obj = CreateOddball("termination_exception",
-                                           Smi::FromInt(-3),
+                                           Smi::FromInt(-4),
                                            Oddball::kOther);
     if (!maybe_obj->ToObject(&obj)) return false;
   }
   set_termination_exception(obj);
 
+  { MaybeObject* maybe_obj = CreateOddball("frame_alignment_marker",
+                                           Smi::FromInt(-5),
+                                           Oddball::kOther);
+    if (!maybe_obj->ToObject(&obj)) return false;
+  }
+  set_frame_alignment_marker(obj);
+  STATIC_ASSERT(Oddball::kLeastHiddenOddballNumber == -5);
+
   // Allocate the empty string.
   { MaybeObject* maybe_obj = AllocateRawAsciiString(0, TENURED);
     if (!maybe_obj->ToObject(&obj)) return false;
   }
   set_empty_string(String::cast(obj));
 
   for (unsigned i = 0; i < ARRAY_SIZE(constant_symbol_table); i++) {
     { MaybeObject* maybe_obj =
           LookupAsciiSymbol(constant_symbol_table[i].contents);
       if (!maybe_obj->ToObject(&obj)) return false;
@@ skipping 4111 matching lines @@
   }
   isolate_->heap()->store_buffer()->Filter(MemoryChunk::ABOUT_TO_BE_FREED);
   for (chunk = chunks_queued_for_free_; chunk != NULL; chunk = next) {
     next = chunk->next_chunk();
     isolate_->memory_allocator()->Free(chunk);
   }
   chunks_queued_for_free_ = NULL;
 }
 
 } }  // namespace v8::internal