[flags] Remove FLAG_log_suspect and related code

This is no longer actively used.

Change-Id: I88b0695732ead8652a21ed5d59f3d9752c0c88d1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3574551Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79826}

src/flags/flag-definitions.h

@@ -2017,7 +2017,6 @@ DEFINE_BOOL(log_code_disassemble, false,
             "Log all disassembled code to the log file.")
 DEFINE_IMPLICATION(log_code_disassemble, log_code)
 DEFINE_BOOL(log_handles, false, "Log global handle events.")
-DEFINE_BOOL(log_suspect, false, "Log suspect operations.")
 DEFINE_BOOL(log_source_code, false, "Log source code.")
 DEFINE_BOOL(log_function_events, false,
             "Log function events "

src/ic/ic.cc

@@ -514,7 +514,6 @@ MaybeHandle<Object> LoadIC::Load(Handle<Object> object, Handle<Name> name,
     if (it.IsFound()) {
       return result;
     } else if (!ShouldThrowReferenceError()) {
-      LOG(isolate(), SuspectReadEvent(*name, *object));
       return result;
     }
   }

src/init/v8.cc

@@ -139,7 +139,6 @@ void V8::Initialize() {
                            &FLAG_log_code,
                            &FLAG_log_code_disassemble,
                            &FLAG_log_handles,
-                           &FLAG_log_suspect,
                            &FLAG_log_source_code,
                            &FLAG_log_function_events,
                            &FLAG_log_internal_timer_events,

src/logging/log.cc

@@ -1611,15 +1611,6 @@ void Logger::MoveEventInternal(LogEventsAndTags event, Address from,
   msg.WriteToLogFile();
 }
 
-void Logger::SuspectReadEvent(Name name, Object obj) {
-  if (!FLAG_log_suspect) return;
-  MSG_BUILDER();
-  String class_name = obj.IsJSObject() ? JSObject::cast(obj).class_name()
-                                       : ReadOnlyRoots(isolate_).empty_string();
-  msg << "suspect-read" << kNext << class_name << kNext << name;
-  msg.WriteToLogFile();
-}
-
 namespace {
 void AppendFunctionMessage(Log::MessageBuilder& msg, const char* reason,
                            int script_id, double time_delta, int start_position,

src/logging/log.h

@@ -148,10 +148,6 @@ class Logger : public CodeEventListener {
   void NewEvent(const char* name, void* object, size_t size);
   void DeleteEvent(const char* name, void* object);
 
-  // Emits an event that an undefined property was read from an
-  // object.
-  void SuspectReadEvent(Name name, Object obj);
-
   // ==== Events logged by --log-function-events ====
   void FunctionEvent(const char* reason, int script_id, double time_delta_ms,
                      int start_position, int end_position,