Fix more specialize locations

Co-authored-by: Shuhei Kadowaki <40514306+aviatesk@users.noreply.github.com>

Author: timholy

base/array.jl

@@ -2756,7 +2756,7 @@ union!(v::AbstractVector{T}, itrs...) where {T} =
 symdiff!(v::AbstractVector{T}, itrs...) where {T} =
     _grow!(_shrink_filter!(symdiff!(Set{T}(), v, itrs...)), v, itrs)
 
-function _shrink!(shrinker!::F, v::AbstractVector, itrs) where F
+function _shrink!(@specialize(shrinker!), v::AbstractVector, itrs)
     seen = Set{eltype(v)}()
     filter!(_grow_filter!(seen), v)
     shrinker!(seen, itrs...)
@@ -2768,7 +2768,7 @@ setdiff!(  v::AbstractVector, itrs...) = _shrink!(setdiff!, v, itrs)
 
 vectorfilter(T::Type, f, v) = T[x for x in v if f(x)]
 
-function _shrink(shrinker!::F, itr, itrs) where F
+function _shrink(@specialize(shrinker!), itr, itrs)
     T = promote_eltype(itr, itrs...)
     keep = shrinker!(Set{T}(itr), itrs...)
     vectorfilter(T, _shrink_filter!(keep), itr)