[turbofan] Fix phi-hinting problem with deferred blocks

test/cctest/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/base/utils/random-number-generator.h"
 #include "src/interface-descriptors.h"
 #include "src/isolate.h"
 #include "test/cctest/compiler/function-tester.h"
 
 namespace v8 {
@@ skipping 1047 matching lines @@
     ft.CheckTrue(object, smi0, expect_bailout);
   }
 
   {
     Handle<JSObject> object = isolate->global_proxy();
     CHECK_EQ(JS_GLOBAL_PROXY_TYPE, object->map()->instance_type());
     ft.CheckTrue(object, smi0, expect_bailout);
   }
 }
 
+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);
+    }
+  }
+  CHECK(!m.GenerateCode().is_null());
+}
+
 }  // namespace internal
 }  // namespace v8