core: Fix restoration of loop target in try statement

I am not sure why this occurs either, it only appears that after the
assignment, `old_loop_target` and `loop_target` are both referencing the
same variable, causing the next line to set both variables as None.

nac3core/src/codegen/stmt.rs

@@ -789,7 +789,10 @@ pub fn gen_try<'ctx, 'a, G: CodeGenerator>(
         ctx.outer_catch_clauses = old_clauses;
         ctx.unwind_target = old_unwind;
         ctx.return_target = old_return;
-        ctx.loop_target = old_loop_target.or(ctx.loop_target).take();
+        if let Some(old_loop_target) = old_loop_target {
+            ctx.loop_target.replace(old_loop_target);
+        }
+        old_loop_target = None;
 
         let old_unwind = if !finalbody.is_empty() {
             let final_landingpad = ctx.ctx.append_basic_block(current_fun, "try.catch.final");
@@ -910,7 +913,9 @@ pub fn gen_try<'ctx, 'a, G: CodeGenerator>(
         }
 
         ctx.unwind_target = old_unwind;
-        ctx.loop_target = old_loop_target.or(ctx.loop_target).take();
+        if let Some(old_loop_target) = old_loop_target {
+            ctx.loop_target.replace(old_loop_target);
+        }
         ctx.return_target = old_return;
 
         ctx.builder.position_at_end(landingpad);