[profiler] fix memory leak for code entries for runtime callstats.

src/profiler/profile-generator.cc

Index: src/profiler/profile-generator.cc
diff --git a/src/profiler/profile-generator.cc b/src/profiler/profile-generator.cc
index b3af769f4b10cc5a59ff9044300e54943bf961d9..446bbffc34fc4e566834c0bd2a4c82c7c49d79aa 100644
--- a/src/profiler/profile-generator.cc
+++ b/src/profiler/profile-generator.cc
@@ -649,10 +649,15 @@ ProfileGenerator::ProfileGenerator(Isolate* isolate,
     DCHECK(counter->name());
     auto entry = new CodeEntry(CodeEventListener::FUNCTION_TAG, counter->name(),
                                CodeEntry::kEmptyNamePrefix, "native V8Runtime");
+    code_entries_.push_back(entry);
     code_map_.AddCode(reinterpret_cast<Address>(counter), entry, 1);
   }
 }
 
+ProfileGenerator::~ProfileGenerator() {
+  for (auto code_entry : code_entries_) delete code_entry;
+}
+
 void ProfileGenerator::RecordTickSample(const TickSample& sample) {
   std::vector<CodeEntry*> entries;
   // Conservatively reserve space for stack frames + pc + function + vm-state.