Rearrange the fields in at::OperandInfo to reduce padding. (#98037)
Summary:
Rearrange the fields in at::OperandInfo to reduce padding.
The current class layout is {64,3,1,1,8,1,1,1,16,16,8,8}. Moving the 5th
element in the class allows the small bytes/bools to be packed together.
This class is frequently read from places like the stack trace below, so
compacting the class could speed things up.
c10/util/MaybeOwned.h:198 operator*
aten/src/ATen/TensorIterator.h:187 tensor_base
aten/src/ATen/TensorIterator.h:322 tensor_base
aten/src/ATen/TensorIterator.cpp:1194 compute_mem_overlaps
aten/src/ATen/TensorIterator.cpp:1475 build
Test Plan: Rely on unit tests.
Differential Revision: D44559604
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98037
Approved by: https://github.com/swolchok
