Bug 1598951 Part 2 - Don't record random numbers in jemalloc, r=glandium.

Depends on D58437

Differential Revision: https://phabricator.services.mozilla.com/D58440

--HG--
extra : moz-landing-system : lando

memory/build/mozjemalloc.cpp

@@ -2810,8 +2810,12 @@ void* arena_t::MallocSmall(size_t aSize, bool aZero) {
       // arc4random.  So we temporarily disable mRandomizeSmallAllocations to
       // skip this case and then re-enable it
       mRandomizeSmallAllocations = false;
-      mozilla::Maybe<uint64_t> prngState1 = mozilla::RandomUint64();
-      mozilla::Maybe<uint64_t> prngState2 = mozilla::RandomUint64();
+      mozilla::Maybe<uint64_t> prngState1, prngState2;
+      {
+        mozilla::recordreplay::AutoEnsurePassThroughThreadEvents pt;
+        prngState1 = mozilla::RandomUint64();
+        prngState2 = mozilla::RandomUint64();
+      }
       void* backing =
           base_alloc(sizeof(mozilla::non_crypto::XorShift128PlusRNG));
       mPRNG = new (backing) mozilla::non_crypto::XorShift128PlusRNG(
@@ -3542,7 +3546,11 @@ arena_t* ArenaCollection::CreateArena(bool aIsPrivate,
   // arena, stopping them from getting data they may want
 
   while (true) {
-    mozilla::Maybe<uint64_t> maybeRandomId = mozilla::RandomUint64();
+    mozilla::Maybe<uint64_t> maybeRandomId;
+    {
+      mozilla::recordreplay::AutoEnsurePassThroughThreadEvents pt;
+      maybeRandomId = mozilla::RandomUint64();
+    }
     MOZ_RELEASE_ASSERT(maybeRandomId.isSome());
 
     // Keep looping until we ensure that the random number we just generated

memory/replace/logalloc/replay/moz.build

@@ -10,6 +10,7 @@ SOURCES += [
     '/mfbt/Assertions.cpp',
     '/mfbt/Poison.cpp',
     '/mfbt/RandomNum.cpp',
+    '/mfbt/RecordReplay.cpp',
     '/mfbt/TaggedAnonymousMemory.cpp',
     '/mfbt/Unused.cpp',
     'Replay.cpp',