[heap] Use all freelist sizes in LocalAllocator

The Scavenger is the only consumer of free list entries besides MC
evacuation and pretenured allocations. Make use of all size classes for
allocation.

Bug: chromium:738865
Change-Id: Ieb62c01b41f2aa62222efac91dde4dce2127ff70
Reviewed-on: https://chromium-review.googlesource.com/580409Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46812}

src/heap/spaces.cc

@@ -1479,6 +1479,10 @@ Page* PagedSpace::RemovePageSafe(int size_in_bytes) {
     page = free_list()->GetPageForCategoryType(kMedium);
   if (!page && static_cast<int>(kSmall) >= minimum_category)
     page = free_list()->GetPageForCategoryType(kSmall);
+  if (!page && static_cast<int>(kTiny) >= minimum_category)
+    page = free_list()->GetPageForCategoryType(kTiny);
+  if (!page && static_cast<int>(kTiniest) >= minimum_category)
+    page = free_list()->GetPageForCategoryType(kTiniest);
   if (!page) return nullptr;
 
   AccountUncommitted(page->size());