inference: fix typeof-tfunc impl (#31405)

(cherry picked from commit 604c9b2)

Author: vtjnash

base/compiler/tfuncs.jl

@@ -441,7 +441,7 @@ function typeof_tfunc(@nospecialize(t))
         a = widenconst(typeof_tfunc(t.a))
         b = widenconst(typeof_tfunc(t.b))
         return Union{a, b}
-    elseif isa(t, TypeVar) && !(Any <: t.ub)
+    elseif isa(t, TypeVar) && !(Any === t.ub)
         return typeof_tfunc(t.ub)
     elseif isa(t, UnionAll)
         return rewrap_unionall(widenconst(typeof_tfunc(unwrap_unionall(t))), t)

test/compiler/inference.jl

@@ -1340,6 +1340,12 @@ let egal_tfunc
     @test egal_tfunc(Union{Int64, Float64}, AbstractArray) === Const(false)
 end
 
+using Core.Compiler: typeof_tfunc
+@test typeof_tfunc(Union{<:T, <:Real} where T<:Complex) == Union{Type{Complex{T}} where T<:Real, Type{<:Real}}
+
+f_typeof_tfunc(x) = typeof(x)
+@test Base.return_types(f_typeof_tfunc, (Union{<:T, Int} where T<:Complex,)) == Any[Union{Type{Int}, Type{Complex{T}} where T<:Real}]
+
 function f23024(::Type{T}, ::Int) where T
     1 + 1
 end