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

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

Index: test/unittests/interpreter/bytecode-array-builder-unittest.cc
diff --git a/test/unittests/interpreter/bytecode-array-builder-unittest.cc b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
index 357aa673c5d723b11da94c8915b89d37b5810355..35a766320841ee44421d1b2df41bac4c3c5ce656 100644
--- a/test/unittests/interpreter/bytecode-array-builder-unittest.cc
+++ b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
@@ -39,6 +39,9 @@ TEST_F(BytecodeArrayBuilderTest, AllBytecodesGenerated) {
   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)