Embed callgrind headers (#45914)
Summary:
Because access to https://sourceware.org/git/valgrind.git can be really slow especially in some regions
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45914
Reviewed By: seemethere
Differential Revision: D24144420
Pulled By: malfet
fbshipit-source-id: a454c8c3182c570ec344bf6468bb5e55d8b8da79
