[GC] Fix code flushing to use bytecode if it exists.

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 6226 matching lines @@
 }
 
 
 Code* SharedFunctionInfo::code() const {
   return Code::cast(READ_FIELD(this, kCodeOffset));
 }
 
 
 void SharedFunctionInfo::set_code(Code* value, WriteBarrierMode mode) {
   DCHECK(value->kind() != Code::OPTIMIZED_FUNCTION);
+  // If the SharedFunctionInfo has bytecode we should never mark it for lazy
+  // compile, since the bytecode is never flushed.
+  DCHECK(value != GetIsolate()->builtins()->builtin(Builtins::kCompileLazy) ||
+         !HasBytecodeArray());
   WRITE_FIELD(this, kCodeOffset, value);
   CONDITIONAL_WRITE_BARRIER(value->GetHeap(), this, kCodeOffset, value, mode);
 }
 
 
 void SharedFunctionInfo::ReplaceCode(Code* value) {
   // If the GC metadata field is already used then the function was
   // enqueued as a code flushing candidate and we remove it now.
   if (code()->gc_metadata() != NULL) {
     CodeFlusher* flusher = GetHeap()->mark_compact_collector()->code_flusher();
@@ skipping 2184 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_