iterators: merge duplicate iterate methods for Reverse

The method bodies and state optional argument definition are exactly
the same.

Author: nsajko

base/iterators.jl

@@ -120,17 +120,9 @@ IteratorSize(::Type{Reverse{T}}) where {T} = IteratorSize(T)
 IteratorEltype(::Type{Reverse{T}}) where {T} = IteratorEltype(T)
 last(r::Reverse) = first(r.itr) # the first shall be last
 
-# reverse-order array iterators: assumes more-specialized Reverse for eachindex
-@propagate_inbounds function iterate(A::Reverse{<:AbstractArray}, state=(reverse(eachindex(A.itr)),))
-    y = iterate(state...)
-    y === nothing && return y
-    idx, itrs = y
-    (A.itr[idx], (state[1], itrs))
-end
-
 # Fallback method of `iterate(::Reverse{T})` which assumes the collection has `getindex(::T) and `reverse(eachindex(::T))`
 # don't propagate inbounds for this just in case
-function iterate(A::Reverse, state=(reverse(eachindex(A.itr)),))
+@propagate_inbounds function iterate(A::Reverse, state=(reverse(eachindex(A.itr)),))
     y = iterate(state...)
     y === nothing && return y
     idx, itrs = y