Remove --log-regexp.

src/regexp/jsregexp.cc

Index: src/regexp/jsregexp.cc
diff --git a/src/regexp/jsregexp.cc b/src/regexp/jsregexp.cc
index c0897bebcff36bf638b989460c47577048d1caaf..bd4e1fc920a85db4b49d5aeade3f0af94feea5e6 100644
--- a/src/regexp/jsregexp.cc
+++ b/src/regexp/jsregexp.cc
@@ -141,11 +141,7 @@ MaybeHandle<Object> RegExpImpl::Compile(Handle<JSRegExp> re,
   MaybeHandle<FixedArray> maybe_cached =
       compilation_cache->LookupRegExp(pattern, flags);
   Handle<FixedArray> cached;
-  bool in_cache = maybe_cached.ToHandle(&cached);
-  LOG(isolate, RegExpCompileEvent(re, in_cache));
-
-  Handle<Object> result;
-  if (in_cache) {
+  if (maybe_cached.ToHandle(&cached)) {
     re->set_data(*cached);
     return re;
   }