[Submodule] Add flash as third-party submodule [Prep for later PRs]#145502
[Submodule] Add flash as third-party submodule [Prep for later PRs]#145502drisspg wants to merge 2 commits intogh/drisspg/117/basefrom
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/145502
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Stack from ghstack (oldest at bottom):
Context
Prototyped here: #144120, we are going to make flash-attention a 3rd party submodule. We will then use the c++ sources and include into our build of libtorch.so
This requires various changes to work including external and internal changes. Since these require internal changes we need to co-dev and in the co-dev environment I haven't found a way to sync submodule changes + internal only changes.
This is unused for now
cc @ptrblck @msaroufim @eqy