[mksnapshot] Ditch the warning on empty builtins PGO data

This is the normal state on the main branch, let's not emit this warning
on every build.

Bug: v8:10470
Change-Id: I29744ea7f67881570fa12c249b12f00d2313289c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3859851
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Auto-Submit: Jakob Linke <jgruber@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82773}

src/builtins/profile-data-reader.cc

@@ -101,13 +101,6 @@ EnsureInitProfileData() {
     // Every function is required to have a hash in the log.
     CHECK(pair.second.hash_has_value());
   }
-  if (data.get()->size() == 0) {
-    PrintF(
-        "No branch hints were found in log file.\n"
-        "See the description of v8_builtins_profiling_log_file in BUILD.gn\n"
-        "for instructions on how to produce hints from a profiled v8.log "
-        "file\n");
-  }
 
   return *data.get();
 }