Port count-based profiler to x64

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index a9cb8e0db6bebb65dd3fb145df8583b29b5b6e93..bcbedebcf60942a3b1dbac18cdf598534e56d642 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4243,11 +4243,6 @@ class Code: public HeapObject {
   inline bool is_compiled_optimizable();
   inline void set_compiled_optimizable(bool value);
 
-  // [has_self_optimization_header]: For FUNCTION kind, tells if it has
-  // a self-optimization header.
-  inline bool has_self_optimization_header();
-  inline void set_self_optimization_header(bool value);
-
   // [allow_osr_at_loop_nesting_level]: For FUNCTION kind, tells for
   // how long the function has been marked for OSR and therefore which
   // level of loop nesting we are willing to do on-stack replacement
@@ -4468,7 +4463,6 @@ class Code: public HeapObject {
       public BitField<bool, 0, 1> {};  // NOLINT
   class FullCodeFlagsHasDebugBreakSlotsField: public BitField<bool, 1, 1> {};
   class FullCodeFlagsIsCompiledOptimizable: public BitField<bool, 2, 1> {};
-  class FullCodeFlagsHasSelfOptimizationHeader: public BitField<bool, 3, 1> {};
 
   static const int kBinaryOpReturnTypeOffset = kBinaryOpTypeOffset + 1;