[startup] Trigger proper OOM if we cannot reserver initial spaces

Bug: chromium:787780
Change-Id: I05f441dc1334a20849fb5afdee8211640f48f6d3
Reviewed-on: https://chromium-review.googlesource.com/785672Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49577}

src/heap/heap.cc

@@ -1488,8 +1488,10 @@ bool Heap::ReserveSpace(Reservation* reservations, std::vector<Address>* maps) {
         // We cannot perfom a GC with an uninitialized isolate. This check
         // fails for example if the max old space size is chosen unwisely,
         // so that we cannot allocate space to deserialize the initial heap.
-        CHECK_WITH_MSG(deserialization_complete_,
-                       "insufficient memory to create an Isolate");
+        if (!deserialization_complete_) {
+          V8::FatalProcessOutOfMemory(
+              "insufficient memory to create an Isolate");
+        }
         if (space == NEW_SPACE) {
           CollectGarbage(NEW_SPACE, GarbageCollectionReason::kDeserializer);
         } else {