Boxed cpu fallback (#2945)
* use in-tree public codegen API.
* use in-tree public codegen API.
* stop pinning to feature branch
* remove torch_pin file before merging. preemptively update yaml to incorporate #2891
* use in-tree public codegen API.
* stop pinning to feature branch
* [WIP] remove bridge:: api from codegen. Start auto-gen'ing out/inplace kernels when possible
* updated torch pin
* fix missing ops in yaml
* remove torch_pin file before merging. preemptively update yaml to incorporate #2891
* make codegen backend-agnostic, except for CPU fallbacks
* remove logging
* rename aten_xla_type.h -> XLANativeFunctions.h
* rename aten_xla_type.h -> XLANativeFunctions.h
* fix rename, delete aten_xla_type.h
* update torch_pin after the file rename
* remove logging info from yaml
* make codegen backend-agnostic, except for CPU fallbacks
* rename aten_xla_type.h -> XLANativeFunctions.h
* fix rename, delete aten_xla_type.h
* use codegen'd inplace kernels, and delete manually written inplace kernels
* fix test change
* lint
* make codegen backend-agnostic, except for CPU fallbacks
* rename aten_xla_type.h -> XLANativeFunctions.h
* use codegen'd inplace kernels, and delete manually written inplace kernels
* [WIP] remove bridge:: api from codegen. Start auto-gen'ing out/inplace kernels when possible
* use a boxed CPU fallback kernel
* remove AtenXlaType from straggler ops
* fix failing tests
* formatting + test fix
* fix overload naming for fallback, made calling it require a bit less boilerplate
* fix name overloads for boxed fallback
* reference the boxed fallback in aten_cpu_fallback.h instead of aten_xla_type_default.h
* fix accidental diff
* revert accidental yaml change
* remove accidentally commited file
* update boxed fallback API usage
* remove accidentally committed file
* lint
* fix issue with calling XLA_COUNTER macro from boxed fallback
* lint
* better comment
* minor pr feedback
* add boxed fallback call to 2 new ops
* remove to_cpu() from yaml, _to_cpu is the right one
* remove torch pin
