Code:  void HeapObjectHeader::Finalize(Address object, size_t object_size) {
   HeapAllocHooks::FreeHookIfEnabled(object);
  const GCInfo* gc_info = ThreadHeap::GcInfo(GcInfoIndex());
   if (gc_info->HasFinalizer())
     gc_info->finalize_(object);
 
  ASAN_RETIRE_CONTAINER_ANNOTATION(object, object_size);
}

Commit Message: [oilpan] Fix GCInfoTable for multiple threads

Previously, grow and access from different threads could lead to a race
on the table backing; see bug.

- Rework the table to work on an existing reservation.
- Commit upon growing, avoiding any copies.

Drive-by: Fix over-allocation of table.

Bug: chromium:841280
Change-Id: I329cb6f40091e14e8c05334ba1104a9440c31d43
Reviewed-on: https://chromium-review.googlesource.com/1061525
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560434}
CWE ID: CWE-362
 void HeapObjectHeader::Finalize(Address object, size_t object_size) {
   HeapAllocHooks::FreeHookIfEnabled(object);
  const GCInfo* gc_info = GCInfoTable::Get().GCInfoFromIndex(GcInfoIndex());
   if (gc_info->HasFinalizer())
     gc_info->finalize_(object);
 
  ASAN_RETIRE_CONTAINER_ANNOTATION(object, object_size);
}
