Separate "configuration" properties in TensorIterator (#39789)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39789
Some properties on TensorIterator are only set prior to build() by the
user and then immutable during the build process. I've renamed all such
properties so that they have a config_ prefix, gave them an explicit
accessor and audited every site to ensure they are only written once.
I also renamed check_mem_overlaps to compute_mem_overlaps to avoid
confusion with the accessor check_mem_overlap.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D21981741
Pulled By: ezyang
fbshipit-source-id: b64e33a5d0bc01834ead6d7082605c20a5ed1a08
