[turbofan] Fix phi-hinting problem with deferred blocks

test/cctest/compiler/test-code-stub-assembler.cc

 // 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.
 
 #include "src/interface-descriptors.h"
 #include "src/isolate.h"
 #include "test/cctest/compiler/function-tester.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 371 matching lines @@
 
   a = m.UndefinedConstant();
   CHECK(!m.ToInt32Constant(a, value32));
   CHECK(!m.ToInt64Constant(a, value64));
 
   a = m.UndefinedConstant();
   CHECK(!m.ToInt32Constant(a, value32));
   CHECK(!m.ToInt64Constant(a, value64));
 }
 
+TEST(DeferredCodePhiHints) {
+  typedef compiler::Node Node;
+  typedef CodeStubAssembler::Label Label;
+  typedef CodeStubAssembler::Variable Variable;
+  Isolate* isolate(CcTest::InitIsolateOnce());
+  VoidDescriptor descriptor(isolate);
+  CodeStubAssemblerTester m(isolate, descriptor);
+  Label block1(&m, Label::kDeferred);
+  m.Goto(&block1);
+  m.Bind(&block1);
+  {
+    Variable var_object(&m, MachineRepresentation::kTagged);
+    Label loop(&m, &var_object);
+    var_object.Bind(m.IntPtrConstant(0));
+    m.Goto(&loop);
+    m.Bind(&loop);
+    {
+      Node* map = m.LoadMap(var_object.value());
+      var_object.Bind(map);
+      m.Goto(&loop);
+    }
+  }
+  USE(m.GenerateCode());

[Mircea Trofin, 2016/06/01 15:02:58]

Why not CHECK there was code generated?

[danno, 2016/06/02 01:29:37]

Done.

+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8