Bug 1858496 - Crash on OOM in ICU; r=jandem,platform-i18n-reviewers,gregtatum

This has been on Nightly for several cycles without serious problems, I think
it makes sense to let it ride the trains, and continue to keep an eye on
crash reports.

Differential Revision: https://phabricator.services.mozilla.com/D191892

xpcom/build/XPCOMInit.cpp

@@ -166,27 +166,19 @@ class ICUReporter final : public nsIMemoryReporter,
   NS_DECL_ISUPPORTS
 
   static void* Alloc(const void*, size_t aSize) {
-#ifdef NIGHTLY_BUILD
     void* result = CountingMalloc(aSize);
     if (result == nullptr) {
       MOZ_CRASH("Ran out of memory while allocating for ICU");
     }
     return result;
-#else
-    return CountingMalloc(aSize);
-#endif
   }
 
   static void* Realloc(const void*, void* aPtr, size_t aSize) {
-#ifdef NIGHTLY_BUILD
     void* result = CountingRealloc(aPtr, aSize);
     if (result == nullptr) {
       MOZ_CRASH("Ran out of memory while reallocating for ICU");
     }
     return result;
-#else
-    return CountingRealloc(aPtr, aSize);
-#endif
   }
 
   static void Free(const void*, void* aPtr) { return CountingFree(aPtr); }