Emit Loop Condition as Separate Block (#21611)
Summary:
Emit loop condition as a separate block in loops, then inline them before conversion to SSA. This is needed for breaks & continues where we will inline the condition block after the continue pass and before the break pass.
I also considered emitting a prim::For and a prim::While, but i think it's easier to just have one pathway.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21611
Differential Revision: D15775820
Pulled By: eellison
fbshipit-source-id: de17c5e65f6e4a0256a660948b1eb630e41b04fb
