Reland 10216 - Optimize the equality check case of ICCompare stubs.

src/mark-compact.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 865 matching lines @@
     heap->mark_compact_collector()->RecordRelocSlot(rinfo, object);
     MarkBit mark = Marking::MarkBitFrom(object);
     heap->mark_compact_collector()->MarkObject(object, mark);
   }
 
   static inline void VisitCodeTarget(Heap* heap, RelocInfo* rinfo) {
     ASSERT(RelocInfo::IsCodeTarget(rinfo->rmode()));
     Code* target = Code::GetCodeFromTargetAddress(rinfo->target_address());
     if (FLAG_cleanup_code_caches_at_gc && target->is_inline_cache_stub()) {
       IC::Clear(rinfo->pc());
-      // Please note targets for cleared inline cached do not have to be
-      // marked since they are contained in HEAP->non_monomorphic_cache().
       target = Code::GetCodeFromTargetAddress(rinfo->target_address());
     } else {
       if (FLAG_cleanup_code_caches_at_gc &&
           target->kind() == Code::STUB &&
           target->major_key() == CodeStub::CallFunction &&
           target->has_function_cache()) {
         CallFunctionStub::Clear(heap, rinfo->pc());
       }
-      MarkBit code_mark = Marking::MarkBitFrom(target);
-      heap->mark_compact_collector()->MarkObject(target, code_mark);
     }
+    MarkBit code_mark = Marking::MarkBitFrom(target);
+    heap->mark_compact_collector()->MarkObject(target, code_mark);
+
     heap->mark_compact_collector()->RecordRelocSlot(rinfo, target);
   }
 
   static inline void VisitDebugTarget(Heap* heap, RelocInfo* rinfo) {
     ASSERT((RelocInfo::IsJSReturn(rinfo->rmode()) &&
             rinfo->IsPatchedReturnSequence()) ||
            (RelocInfo::IsDebugBreakSlot(rinfo->rmode()) &&
             rinfo->IsPatchedDebugBreakSlotSequence()));
     Code* target = Code::GetCodeFromTargetAddress(rinfo->call_address());
     MarkBit code_mark = Marking::MarkBitFrom(target);
@@ skipping 2995 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal