[interpreter] Elide OSR polling from fake loops.

test/mjsunit/regress/regress-5252.js

+// Copyright 2016 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 --ignition --ignition-osr --turbo-from-bytecode
+
+(function TestNonLoopyLoop() {
+  function f() {
+    do {
+      %OptimizeOsr();
+      return 23;
+    } while(false)
+  }
+  assertEquals(23, f());
+  assertEquals(23, f());
+})();
+
+(function TestNonLoopyGenerator() {
+  function* g() {
+    do {
+      %OptimizeOsr();
+      yield 23;
+      yield 42;
+    } while(false)
+    return 999;
+  }
+  var gen = g();
+  assertEquals({ value:23, done:false }, gen.next());
+  assertEquals({ value:42, done:false }, gen.next());
+  assertEquals({ value:999, done:true }, gen.next());
+})();