Delete duplicate copy of THCCachingAllocator (round two). (#16615)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16615
This is another go at landing https://github.com/pytorch/pytorch/pull/16226
Now that the caching allocator is moved to c10_cuda, we can
delete the duplicate copy from Caffe2.
The difference between this and the previous PR is that this
version faithfully maintains the binding code; in particular,
we end up with a SECOND copy of the caching allocator in
this patch. I verified that this code does NOT cause a crash
in the workflow we canaried last time.
In further diffs, I plan to eliminate the second copy, and then
adjust the binding code.
Reviewed By: dzhulgakov
Differential Revision: D13901067
fbshipit-source-id: 66331fd4eadffd0a5defb3cea532d5cd07287872
