In interpolate, inline the call to _interp_output_size (#37173)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37173
This function is only called in one place, so inline it. This eliminates
boilerplate related to overloads and allows for further simplification
of shared logic in later diffs.
All shared local variables have the same names (from closed_over_args),
and no local variables accidentally collide.
ghstack-source-id: 106938108
Test Plan: Existing tests for interpolate.
Differential Revision: D21209995
fbshipit-source-id: acfadf31936296b2aac0833f704764669194b06f
