Do not pretenure descriptor arrays.

Even though descriptor arrays are references by maps in the old
generation, they seems to be short living in benchmarks.

This fixes perf regressions introduced in 1ad0cd56.

Bug:chromium:911073,chromium:910567,chromium:910443,

Change-Id: Iaf933d409e72c6c26df48f6435f9543224ea7d67
Reviewed-on: https://chromium-review.googlesource.com/c/1363146Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58050}

src/heap/factory.cc

@@ -1897,7 +1897,7 @@ Handle<DescriptorArray> Factory::NewDescriptorArray(int number_of_descriptors,
   int size = DescriptorArray::SizeFor(number_of_all_descriptors);
   DCHECK_LT(size, kMaxRegularHeapObjectSize);
   HeapObject* obj =
-      isolate()->heap()->AllocateRawWithRetryOrFail(size, OLD_SPACE);
+      isolate()->heap()->AllocateRawWithRetryOrFail(size, NEW_SPACE);
   obj->set_map_after_allocation(*descriptor_array_map(), SKIP_WRITE_BARRIER);
   DescriptorArray array = DescriptorArray::cast(obj);
   array->Initialize(*empty_enum_cache(), *undefined_value(),