[turbofan] Fix JSInliner to handle non-returning bodies.

test/mjsunit/regress/regress-crbug-530598.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-inlining
+
+var f1 = (function() {
+  "use asm";
+  function g() { throw 0; }
+  function f() { return g(); }
+  return f;
+})();
+assertThrows("f1()");
+%OptimizeFunctionOnNextCall(f1);
+assertThrows("f1()");
+
+var f2 = (function() {
+  "use asm";
+  function g() { for (;;); }
+  function f(a) { return a || g(); }
+  return f;
+})();
+assertTrue(f2(true));
+%OptimizeFunctionOnNextCall(f2);
+assertTrue(f2(true));