Remove --log-regexp.

src/log.cc

Index: src/log.cc
diff --git a/src/log.cc b/src/log.cc
index fc7fcb9ced74fb9863870617170cda4870d60679..f2be02e1cec964f55554568613a3a974104a4fdb 100644
--- a/src/log.cc
+++ b/src/log.cc
@@ -893,64 +893,6 @@ void Logger::LeaveExternal(Isolate* isolate) {
 TIMER_EVENTS_LIST(V)
 #undef V
 
-
-namespace {
-// Emits the source code of a regexp. Used by regexp events.
-void LogRegExpSource(Handle<JSRegExp> regexp, Isolate* isolate,
-                     Log::MessageBuilder* msg) {
-  // Prints "/" + re.source + "/" +
-  //      (re.global?"g":"") + (re.ignorecase?"i":"") + (re.multiline?"m":"")
-
-  Handle<Object> source =
-      JSReceiver::GetProperty(isolate, regexp, "source").ToHandleChecked();
-  if (!source->IsString()) {
-    msg->Append("no source");
-    return;
-  }
-
-  switch (regexp->TypeTag()) {
-    case JSRegExp::ATOM:
-      msg->Append('a');
-      break;
-    default:
-      break;
-  }
-  msg->Append('/');
-  msg->AppendDetailed(*Handle<String>::cast(source), false);
-  msg->Append('/');
-
-  // global flag
-  Handle<Object> global =
-      JSReceiver::GetProperty(isolate, regexp, "global").ToHandleChecked();
-  if (global->IsTrue(isolate)) {
-    msg->Append('g');
-  }
-  // ignorecase flag
-  Handle<Object> ignorecase =
-      JSReceiver::GetProperty(isolate, regexp, "ignoreCase").ToHandleChecked();
-  if (ignorecase->IsTrue(isolate)) {
-    msg->Append('i');
-  }
-  // multiline flag
-  Handle<Object> multiline =
-      JSReceiver::GetProperty(isolate, regexp, "multiline").ToHandleChecked();
-  if (multiline->IsTrue(isolate)) {
-    msg->Append('m');
-  }
-}
-}  // namespace
-
-
-void Logger::RegExpCompileEvent(Handle<JSRegExp> regexp, bool in_cache) {
-  if (!log_->IsEnabled() || !FLAG_log_regexp) return;
-  Log::MessageBuilder msg(log_);
-  msg.Append("regexp-compile,");
-  LogRegExpSource(regexp, isolate_, &msg);
-  msg.Append(in_cache ? ",hit" : ",miss");
-  msg.WriteToLogFile();
-}
-
-
 void Logger::ApiNamedPropertyAccess(const char* tag,
                                     JSObject* holder,
                                     Object* name) {