use == to compare to Union{Bool,Int} in broadcast test

otherwise we can run into `Union{Bool,Int} !== Union{Int,Bool}`

Author: JeffBezanson

test/broadcast.jl

@@ -346,7 +346,7 @@ end
 let f17314 = x -> x < 0 ? false : x
     @test eltype(broadcast(f17314, 1:3)) === Int
     @test eltype(broadcast(f17314, -1:1)) === Integer
-    @test eltype(broadcast(f17314, Int[])) === Union{Bool,Int}
+    @test eltype(broadcast(f17314, Int[])) == Union{Bool,Int}
 end
 let io = IOBuffer()
     broadcast(x->print(io,x), 1:5) # broadcast with side effects