swift

68dcf843 - [AutoDiff] Support differentiation of side effects. (#22057)

[AutoDiff] Support differentiation of side effects. (#22057) * [AutoDiff] Support differentiation of side effects. This patch adds support for differentiating through reads and writes from/to `var`s. Specifically, what made this possible is a set of differentiation rules for side-effecting operations: `alloc_stack`, `dealloc_stack`, `begin_access`, `end_access`, `load`, `store`, etc. This patch also fixes the following minor bugs: * When `AdjointEmitter::getAdjointValue` creates a default adjoint value, correctly remap the original type to get rid of archetypes. * Handle more reference counting instructions. * Emit better diagnostics for not being able to differentiate writes to global variables and to mutable captures. Note: * Temporarily allow memory leaks to unblock progress/fix tests.