revert part of cf2ed66 to fix JuliaDB test failure

Ref #24678
(cherry picked from commit 2f19f3f)

Author: JeffBezanson

base/reflection.jl

@@ -515,10 +515,7 @@ function _methods_by_ftype(t::ANY, lim::Int, world::UInt, min::Array{UInt,1}, ma
         end
     end
     if 1 < nu <= 64
-        ms = _methods_by_ftype(Any[tp...], t, length(tp), lim, [], world, min, max)
-        if all(m->isleaftype(m[1]), ms)
-            return ms
-        end
+        return _methods_by_ftype(Any[tp...], t, length(tp), lim, [], world, min, max)
     end
     # XXX: the following can return incorrect answers that the above branch would have corrected
     return ccall(:jl_matching_methods, Any, (Any, Cint, Cint, UInt, Ptr{UInt}, Ptr{UInt}), t, lim, 0, world, min, max)

test/inference.jl

@@ -963,14 +963,14 @@ end
 # approximate static parameters due to unions
 let T1 = Array{Float64}, T2 = Array{_1,2} where _1
     inference_test_copy(a::T) where {T<:Array} = ccall(:jl_array_copy, Ref{T}, (Any,), a)
-    rt = Base.return_types(inference_test_copy, (Union{T1,T2},))[1]
+    rt = Union{Base.return_types(inference_test_copy, (Union{T1,T2},))...}
     @test rt >: T1 && rt >: T2
 
     el(x::T) where {T} = eltype(T)
-    rt = Base.return_types(el, (Union{T1,Array{Float32,2}},))[1]
+    rt = Union{Base.return_types(el, (Union{T1,Array{Float32,2}},))...}
     @test rt >: Union{Type{Float64}, Type{Float32}}
 
     g(x::Ref{T}) where {T} = T
-    rt = Base.return_types(g, (Union{Ref{Array{Float64}}, Ref{Array{Float32}}},))[1]
+    rt = Union{Base.return_types(g, (Union{Ref{Array{Float64}}, Ref{Array{Float32}}},))...}
     @test rt >: Union{Type{Array{Float64}}, Type{Array{Float32}}}
 end