[turbofan] Fix exit control flow in TryCatchBuilder.

test/mjsunit/regress/regress-crbug-505354.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --turbo-filter=f
-// Flags: --noanalyze-environment-liveness
 
 function f() {
-  var x = 0;
-  for (var y = 0; y < 0; ++y) {
-    x = (x + y) | 0;
-  }
-  return unbound;
+  "use strict";
+  try {
+    for (let i = 0; i < 10; i++) {}
+  } catch(e) {}
 }
 %OptimizeFunctionOnNextCall(f);
-assertThrows(f, ReferenceError);
+f();