Bug 1785162 - Always stall on OOM on Windows in Nightly r=gsvelto

It's suspected that this may induce performance regressions. Do it
anyway, just to find out how bad it is. (But only on Nightly, for now.)

For simplicity's sake, this does not include any additional telemetry;
the decision of whether and what any additional telemetry is needed will
be deferred until we have some feedback from what we've already got.

Differential Revision: https://phabricator.services.mozilla.com/D155301

memory/build/mozjemalloc.cpp

@@ -1389,6 +1389,9 @@ static inline bool ShouldStallAndRetry() {
   // on Windows mostly skips this in favor of directly calling ::VirtualAlloc(),
   // though, so it's probably not going to matter whether we stall here or not.)
   return true;
+#  elif defined(NIGHTLY_BUILD)
+  // On Nightly, always stall, for experiment's sake (bug 1785162).
+  return true;
 #  else
   // In the main process, always stall.
   if (GetGeckoProcessType() == GeckoProcessType::GeckoProcessType_Default) {