Don't attempt to const prop call cycles

Even if the result is unused. Fixes #31974.

Author: Keno

base/compiler/abstractinterpretation.jl

@@ -258,7 +258,7 @@ function abstract_call_method(method::Method, @nospecialize(sig), sparams::Simpl
                     # we have a self-cycle in the call-graph, but not in the inference graph (typically):
                     # break this edge now (before we record it) by returning early
                     # (non-typically, this means that we lose the ability to detect a guaranteed StackOverflow in some cases)
-                    return Any, false, nothing
+                    return Any, true, nothing
                 end
                 topmost = nothing
                 edgecycle = true
@@ -339,7 +339,7 @@ function abstract_call_method(method::Method, @nospecialize(sig), sparams::Simpl
                 # since it's very unlikely that we'll try to inline this,
                 # or want make an invoke edge to its calling convention return type.
                 # (non-typically, this means that we lose the ability to detect a guaranteed StackOverflow in some cases)
-                return Any, false, nothing
+                return Any, true, nothing
             end
             poison_callstack(sv, topmost::InferenceState, true)
             sig = newsig

test/compiler/inference.jl

@@ -2414,3 +2414,10 @@ let
     f = MixedKeyDict((Dict(2 => 7), Dict(5. => 11)))
     @test merge(+, d, e, f).dicts == (Dict(1 => 10, 2 => 7), Dict(4.0 => 2, 5.0 => 20))
 end
+
+# Issue #31974
+f31974(a::UnitRange) = (if first(a) <= last(a); f31974((first(a)+1):last(a)); end; a)
+f31974(n::Int) = f31974(1:n)
+# This query hangs if type inference improperly attempts to const prop
+# call cycles.
+@test code_typed(f31974, Tuple{Int}) !== nothing