[Interpreter] Add support for loading globals in the interpreter.

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 "test/unittests/test-utils.h"
 
 namespace v8 {
@@ skipping 21 matching lines @@
       .LoadUndefined()
       .LoadNull()
       .LoadTheHole()
       .LoadTrue()
       .LoadFalse();
 
   // Emit accumulator transfers.
   Register reg(0);
   builder.LoadAccumulatorWithRegister(reg).StoreAccumulatorInRegister(reg);
 
+  // Emit global load operations.
+  builder.LoadGlobal(1);
+
   // Emit load / store property operations.
   builder.LoadNamedProperty(reg, 0, LanguageMode::SLOPPY)
       .LoadKeyedProperty(reg, 0, LanguageMode::SLOPPY)
       .StoreNamedProperty(reg, reg, 0, LanguageMode::SLOPPY)
       .StoreKeyedProperty(reg, reg, 0, LanguageMode::SLOPPY);
 
   // Call operations.
   builder.Call(reg, reg, 0);
 
   // Emit binary operators invocations.
@@ skipping 124 matching lines @@
       .LoadLiteral(heap_num_2_copy);
 
   Handle<BytecodeArray> array = builder.ToBytecodeArray();
   // Should only have one entry for each identical constant.
   CHECK_EQ(array->constant_pool()->length(), 3);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8