…platforms. r=gw

It was previously set on mac only due to driver mischiefs, however the cost of growing texture arrays becomes high with large layer counts, which capping the layer count to 32 everywhere helps mitigate at the expense of batch breaks.

Depends on D67368

Differential Revision: https://phabricator.services.mozilla.com/D67369

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/8f4b47079a44eeea87caa560b3b072148551aa3c