Revert of Tenure descriptor arrays. (patchset #1 id:1 of...

Revert of Tenure descriptor arrays. (patchset #1 id:1 of https://codereview.chromium.org/1526663002/ )

Reason for revert:
Regresses memory consumption.

BUG=571180,571657
LOG=n

Original issue's description:
> Tenure descriptor arrays.
>
> BUG=
>
> Committed: https://crrev.com/74bc69166de8cfb967e79b5c8cc31c2a76490dc8
> Cr-Commit-Position: refs/heads/master@{#32846}

TBR=ishell@chromium.org,ulan@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.

Review URL: https://codereview.chromium.org/1606003002

Cr-Commit-Position: refs/heads/master@{#33394}

src/objects.cc

@@ -10781,7 +10781,7 @@ Handle<DescriptorArray> DescriptorArray::Allocate(Isolate* isolate,
   int size = number_of_descriptors + slack;
   if (size == 0) return factory->empty_descriptor_array();
   // Allocate the array of keys.
-  Handle<FixedArray> result = factory->NewFixedArray(LengthFor(size), TENURED);
+  Handle<FixedArray> result = factory->NewFixedArray(LengthFor(size));
 
   result->set(kDescriptorLengthIndex, Smi::FromInt(number_of_descriptors));
   result->set(kEnumCacheIndex, Smi::FromInt(0));