Eliminate the need for code delete events in CPU profiler.

src/cpu-profiler.h

 // Copyright 2010 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 30 matching lines @@
 class CodeMap;
 class CpuProfile;
 class CpuProfilesCollection;
 class HashMap;
 class ProfileGenerator;
 class TokenEnumerator;
 
 #define CODE_EVENTS_TYPE_LIST(V)                                   \
   V(CODE_CREATION,    CodeCreateEventRecord)                       \
   V(CODE_MOVE,        CodeMoveEventRecord)                         \
-  V(CODE_DELETE,      CodeDeleteEventRecord)                       \
   V(SHARED_FUNC_MOVE, SharedFunctionInfoMoveEventRecord)
 
 
 class CodeEventRecord {
  public:
 #define DECLARE_TYPE(type, ignore) type,
   enum Type {
     NONE = 0,
     CODE_EVENTS_TYPE_LIST(DECLARE_TYPE)
     NUMBER_OF_TYPES
@@ skipping 18 matching lines @@
 
 class CodeMoveEventRecord : public CodeEventRecord {
  public:
   Address from;
   Address to;
 
   INLINE(void UpdateCodeMap(CodeMap* code_map));
 };
 
 
-class CodeDeleteEventRecord : public CodeEventRecord {
- public:
-  Address start;
-
-  INLINE(void UpdateCodeMap(CodeMap* code_map));
-};
-
-
 class SharedFunctionInfoMoveEventRecord : public CodeEventRecord {
  public:
   Address from;
   Address to;
 
   INLINE(void UpdateCodeMap(CodeMap* code_map));
 };
 
 
 class TickSampleEventRecord {
@@ skipping 176 matching lines @@
   Atomic32 is_profiling_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CpuProfiler);
 };
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_CPU_PROFILER_H_