[Interpreter] Add support for Load / Store to Lookup slots.

test/unittests/interpreter/bytecode-array-builder-unittest.cc

 // Copyright 2014 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/v8.h"
 
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/bytecode-array-iterator.h"
 #include "test/unittests/test-utils.h"
 
@@ skipping 75 matching lines @@
   // Emit wide load / store property operations.
   builder.LoadNamedProperty(reg, 2056, 0, LanguageMode::SLOPPY)
       .LoadKeyedProperty(reg, 2056, LanguageMode::SLOPPY)
       .StoreNamedProperty(reg, 0, 2056, LanguageMode::SLOPPY)
       .StoreKeyedProperty(reg, reg, 2056, LanguageMode::SLOPPY)
       .LoadNamedProperty(reg, 2056, 0, LanguageMode::STRICT)
       .LoadKeyedProperty(reg, 2056, LanguageMode::STRICT)
       .StoreNamedProperty(reg, 0, 2056, LanguageMode::STRICT)
       .StoreKeyedProperty(reg, reg, 2056, LanguageMode::STRICT);
 
+  // Emit load / store lookup slots.
+  Factory* factory = isolate()->factory();
+  Handle<String> name = factory->NewStringFromStaticChars("var_name");
+  builder.LoadLookupSlot(name, TypeofMode::NOT_INSIDE_TYPEOF)
+      .LoadLookupSlot(name, TypeofMode::INSIDE_TYPEOF)
+      .StoreLookupSlot(name, LanguageMode::SLOPPY)
+      .StoreLookupSlot(name, LanguageMode::STRICT);
+
   // Emit closure operations.
-  Factory* factory = isolate()->factory();
   Handle<SharedFunctionInfo> shared_info = factory->NewSharedFunctionInfo(
       factory->NewStringFromStaticChars("function_a"), MaybeHandle<Code>(),
       false);
   builder.CreateClosure(shared_info, NOT_TENURED);
 
   // Emit argument creation operations.
   builder.CreateArguments(CreateArgumentsType::kMappedArguments)
       .CreateArguments(CreateArgumentsType::kUnmappedArguments);
 
   // Emit literal creation operations.
@@ skipping 551 matching lines @@
     iterator.Advance();
   }
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
   iterator.Advance();
   CHECK(iterator.done());
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8