Fix ambiguity warnings with SharedArray

As reported and discussed here:
#8432 (comment)

Author: Jutho

base/sharedarray.jl

@@ -210,12 +210,12 @@ convert(::Type{Array}, S::SharedArray) = S.s
 getindex(S::SharedArray) = getindex(S.s)
 getindex(S::SharedArray, I::Real) = getindex(S.s, I)
 getindex(S::SharedArray, I::AbstractArray) = getindex(S.s, I)
-@nsplat N 1:5 getindex(S::SharedArray, I::NTuple{N,Any}...) = getindex(S.s, I...)
+@nsplat N 1:5 getindex(S::SharedArray, I::NTuple{N,Union(Real,AbstractVector)}...) = getindex(S.s, I...)
 
 setindex!(S::SharedArray, x) = setindex!(S.s, x)
 setindex!(S::SharedArray, x, I::Real) = setindex!(S.s, x, I)
 setindex!(S::SharedArray, x, I::AbstractArray) = setindex!(S.s, x, I)
-@nsplat N 1:5 setindex!(S::SharedArray, x, I::NTuple{N,Any}...) = setindex!(S.s, x, I...)
+@nsplat N 1:5 setindex!(S::SharedArray, x, I::NTuple{N,Union(Real,AbstractVector)}...) = setindex!(S.s, x, I...)
 
 function fill!(S::SharedArray, v)
     f = S->fill!(S.loc_subarr_1d, v)