add total wall time in calculate_time_spent (#130611)
Summary:
Fixes #ISSUE_NUMBER
Actual wall time is fwd_entire_frame_time + bwd_inductor_compile. `calculate_time_spent` is accessed internally for monitoring use https://fburl.com/code/iiurj5m6. However, summing values up lose the info of fwd/bwd.
This PR adds a new key of `total_wall_time` without affecting dynamo counters.
X-link: https://github.com/pytorch/pytorch/pull/130611
Approved by: https://github.com/oulgen, https://github.com/Yuzhen11
Reviewed By: izaitsevfb
Differential Revision: D59724060
Pulled By: dshi7
fbshipit-source-id: b99d1d12127e82b322da64f544e00d88d5ddea82
