Eliminate the need for code delete events in CPU profiler.

test/cctest/test-profile-generator.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 //
 // Tests of profiles generator and utilities.
 
 #include "v8.h"
 #include "profile-generator-inl.h"
 #include "cctest.h"
 #include "../include/v8-profiler.h"
 
 using i::CodeEntry;
@@ skipping 531 matching lines @@
 TEST(CodeMapMoveAndDeleteCode) {
   CodeMap code_map;
   CodeEntry entry1(i::Logger::FUNCTION_TAG, "", "aaa", "", 0,
                    TokenEnumerator::kNoSecurityToken);
   CodeEntry entry2(i::Logger::FUNCTION_TAG, "", "bbb", "", 0,
                    TokenEnumerator::kNoSecurityToken);
   code_map.AddCode(ToAddress(0x1500), &entry1, 0x200);
   code_map.AddCode(ToAddress(0x1700), &entry2, 0x100);
   CHECK_EQ(&entry1, code_map.FindEntry(ToAddress(0x1500)));
   CHECK_EQ(&entry2, code_map.FindEntry(ToAddress(0x1700)));
-  code_map.MoveCode(ToAddress(0x1500), ToAddress(0x1800));
+  code_map.MoveCode(ToAddress(0x1500), ToAddress(0x1700));  // Deprecate bbb.
   CHECK_EQ(NULL, code_map.FindEntry(ToAddress(0x1500)));
-  CHECK_EQ(&entry2, code_map.FindEntry(ToAddress(0x1700)));
-  CHECK_EQ(&entry1, code_map.FindEntry(ToAddress(0x1800)));
-  code_map.DeleteCode(ToAddress(0x1700));
+  CHECK_EQ(&entry1, code_map.FindEntry(ToAddress(0x1700)));
+  CodeEntry entry3(i::Logger::FUNCTION_TAG, "", "ccc", "", 0,
+                   TokenEnumerator::kNoSecurityToken);
+  code_map.AddCode(ToAddress(0x1750), &entry3, 0x100);
   CHECK_EQ(NULL, code_map.FindEntry(ToAddress(0x1700)));
-  CHECK_EQ(&entry1, code_map.FindEntry(ToAddress(0x1800)));
+  CHECK_EQ(&entry3, code_map.FindEntry(ToAddress(0x1750)));
 }
 
 
 namespace {
 
 class TestSetup {
  public:
   TestSetup()
       : old_flag_prof_browser_mode_(i::FLAG_prof_browser_mode) {
     i::FLAG_prof_browser_mode = false;
@@ skipping 244 matching lines @@
     i::Vector<char> title = i::Vector<char>::New(16);
     i::OS::SNPrintF(title, "%d", i);
     CHECK(collection.StartProfiling(title.start(), i + 1));  // UID must be > 0.
     titles[i] = title.start();
   }
   CHECK(!collection.StartProfiling(
       "maximum", CpuProfilesCollection::kMaxSimultaneousProfiles + 1));
   for (int i = 0; i < CpuProfilesCollection::kMaxSimultaneousProfiles; ++i)
     i::DeleteArray(titles[i]);
 }