Dan Zheng 1775e8ae16 [AutoDiff upstream] Add VJPEmitter. ...

`VJPEmitter` is a cloner that emits VJP functions. It implements reverse-mode
automatic differentiation, along with `PullbackEmitter`.

`VJPEmitter` clones an original function, replacing function applications with
VJP function applications. In VJP functions, each basic block takes a pullback
struct (containing callee pullbacks) and produces a predecessor enum: these data
structures are consumed by pullback functions.

2020-04-05 20:35:35 -07:00

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