AbstractInterpreter: remove dead logic within transform_result_for_cache (#41884)

Author: aviatesk

base/compiler/typeinfer.jl

@@ -354,16 +354,10 @@ end
 
 function transform_result_for_cache(interp::AbstractInterpreter, linfo::MethodInstance,
                                     valid_worlds::WorldRange, @nospecialize(inferred_result))
-    local const_flags::Int32
     # If we decided not to optimize, drop the OptimizationState now.
     # External interpreters can override as necessary to cache additional information
     if inferred_result isa OptimizationState
-        opt = inferred_result
-        if isa(opt.src, CodeInfo)
-            inferred_result = ir_to_codeinf!(opt)
-        else
-            inferred_result = opt.src
-        end
+        inferred_result = ir_to_codeinf!(inferred_result)
     end
     if inferred_result isa CodeInfo
         inferred_result.min_world = first(valid_worlds)