inference: Don't try to infer optimized opaque_closure (#56557)

We don't have frontend syntax for it, but there is a use case for having
`:new_opaque_closure` take an OC constructed from an optimized
OpaqueClosure (and just replacing the capture environment). In this
case, there is nothing inference can do to introspect into the opaque
closure, so it just needs to bail out early.

Author: Keno

Compiler/src/abstractinterpretation.jl

@@ -2633,6 +2633,14 @@ function abstract_call_opaque_closure(interp::AbstractInterpreter,
     ocsig = rewrap_unionall(Tuple{Tuple, ocargsig′.parameters...}, ocargsig)
     hasintersect(sig, ocsig) || return Future(CallMeta(Union{}, Union{MethodError,TypeError}, EFFECTS_THROWS, NoCallInfo()))
     ocmethod = closure.source::Method
+    if !isdefined(ocmethod, :source)
+        # This opaque closure was created from optimized source. We cannot infer it further.
+        ocrt = rewrap_unionall((unwrap_unionall(tt)::DataType).parameters[2], tt)
+        if isa(ocrt, DataType)
+            return Future(CallMeta(ocrt, Any, Effects(), NoCallInfo()))
+        end
+        return Future(CallMeta(Any, Any, Effects(), NoCallInfo()))
+    end
     match = MethodMatch(sig, Core.svec(), ocmethod, sig <: ocsig)
     mresult = abstract_call_method(interp, ocmethod, sig, Core.svec(), false, si, sv)
     ocsig_box = Core.Box(ocsig)

Compiler/src/stmtinfo.jl

@@ -352,7 +352,7 @@ allow the optimizer to rewrite the return type parameter of the `OpaqueClosure`
 struct OpaqueClosureCreateInfo <: CallInfo
     unspec::CallMeta
     function OpaqueClosureCreateInfo(unspec::CallMeta)
-        @assert isa(unspec.info, OpaqueClosureCallInfo)
+        @assert isa(unspec.info, Union{OpaqueClosureCallInfo, NoCallInfo})
         return new(unspec)
     end
 end