Remove special handling of multiple inputs to pullbacks from ChainRules#1

Merged

oxinabox merged 6 commits intooxinabox:ox/chainrules_step1bfrom FluxML:ox/cr_1pb

May 20, 2020

+18-41

Commits on May 7, 2020

ChainRules pullbacks always have 1 input JuliaDiff/ChainRulesCore.jl#152
oxinabox
committed

Commits on May 18, 2020

Commits on May 20, 2020