Add partialsortperm! rrule

Author: andrewrosemberg

src/rulesets/Base/nondiff.jl

@@ -290,6 +290,7 @@ VERSION >= v"1.4" && @non_differentiable only(::Char)
 @non_differentiable open(::Any)
 
 @non_differentiable partialsortperm(::AbstractVector{Any}, ::Union{Integer, OrdinalRange})
+@non_differentiable partialsortperm!(::AbstractVector{<:Integer}, ::AbstractVector{Any}, ::Union{Integer, OrdinalRange})
 @non_differentiable pointer(::Any)
 @non_differentiable popdisplay(::AbstractDisplay)
 @non_differentiable position(::Base.Filesystem.File)
@@ -354,7 +355,7 @@ end
 @non_differentiable sort(::AbstractVector)
 @non_differentiable sort!(::AbstractVector)
 @non_differentiable sortperm(::AbstractVector{Any})
-@non_differentiable sortperm!(AbstractVector{<:Integer}, ::AbstractVector)
+@non_differentiable sortperm!(::AbstractVector{<:Integer}, ::AbstractVector)
 @non_differentiable split(::AbstractString)
 @non_differentiable split(::AbstractString, ::AbstractChar)
 @non_differentiable splitdir(::AbstractString)