[Interpreter] Add support for VisitThisFunction.

test/cctest/interpreter/test-bytecode-generator.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.
 
 // TODO(rmcilroy): Remove this define after this flag is turned on globally
 #define V8_IMMINENT_DEPRECATION_WARNINGS
 
 #include "src/v8.h"
 
 #include "src/compiler.h"
@@ skipping 5129 matching lines @@
        }},
   };
 
   for (size_t i = 0; i < arraysize(snippets); i++) {
     Handle<BytecodeArray> bytecode_array =
         helper.MakeBytecodeForFunctionBody(snippets[i].code_snippet);
     CheckBytecodeArrayEqual(snippets[i], bytecode_array);
   }
 }
 
+
+TEST(ThisFunction) {
+  InitializedHandleScope handle_scope;
+  BytecodeGeneratorHelper helper;
+
+  int closure = Register::function_closure().index();
+
+  ExpectedSnippet<int> snippets[] = {
+      {"var f;\n f = function f() { }",
+       1 * kPointerSize,
+       1,
+       9,
+       {
+           B(LdaTheHole),        //
+           B(Star), R(0),        //
+           B(Ldar), R(closure),  //
+           B(Star), R(0),        //
+           B(LdaUndefined),      //
+           B(Return),            //
+       }},
+      {"var f;\n f = function f() { return f; }",
+       1 * kPointerSize,
+       1,
+       10,
+       {
+           B(LdaTheHole),        //
+           B(Star), R(0),        //
+           B(Ldar), R(closure),  //
+           B(Star), R(0),        //
+           B(Ldar), R(0),        //
+           B(Return),            //
+       }},
+  };
+
+  for (size_t i = 0; i < arraysize(snippets); i++) {
+    Handle<BytecodeArray> bytecode_array =
+        helper.MakeBytecodeForFunction(snippets[i].code_snippet);
+    CheckBytecodeArrayEqual(snippets[i], bytecode_array);
+  }
+}
+
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8