[turbofan] Fix deopt point for [[ToObject]] lazy bailout.

test/mjsunit/regress/regress-5205.js

Index: test/mjsunit/regress/regress-5205.js
diff --git a/test/mjsunit/regress/regress-5205.js b/test/mjsunit/regress/regress-5205.js
new file mode 100644
index 0000000000000000000000000000000000000000..0d88f450539f028e6954100f2ca9a875b952937e
--- /dev/null
+++ b/test/mjsunit/regress/regress-5205.js
@@ -0,0 +1,37 @@
+// 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 --gc-global
+
+(function TestGCDuringToObjectForWith() {
+  function f(o) {
+    if (o == 'warmup') { return g() }
+    with (o) { return x }
+  }
+  function g() {
+    // Only a marker function serving as weak embedded object.
+  }
+
+  // Warm up 'f' so that weak embedded object 'g' will be used.
+  f('warmup');
+  f('warmup');
+  g = null;
+
+  // Test that 'f' behaves correctly unoptimized.
+  assertEquals(23, f({ x:23 }));
+  assertEquals(42, f({ x:42 }));
+
+  // Test that 'f' behaves correctly optimized.
+  %OptimizeFunctionOnNextCall(f);
+  assertEquals(65, f({ x:65 }));
+
+  // Test that 'f' behaves correctly on numbers.
+  Number.prototype.x = 99;
+  assertEquals(99, f(0));
+
+  // Make sure the next [[ToObject]] allocation triggers GC. This in turn will
+  // deoptimize 'f' because it has the weak embedded object 'g' in the code.
+  %SetAllocationTimeout(1000, 1, false);
+  assertEquals(99, f(0));
+})();