[Interpreter] Adds support for wide variant of load/store lookup slots.

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 144a92d990d0a681c45f0dac76d99f60457e9fe3..68de073f9ebda1cc34b4f0324f4ee403b565cd1b 100644
--- a/test/unittests/interpreter/bytecode-array-builder-unittest.cc
+++ b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
@@ -233,6 +233,12 @@ TEST_F(BytecodeArrayBuilderTest, AllBytecodesGenerated) {
       .StoreNamedProperty(reg, wide_name, 0, LanguageMode::STRICT)
       .StoreKeyedProperty(reg, reg, 2056, LanguageMode::STRICT);
 
+  // Emit wide load / store lookup slots.
+  builder.LoadLookupSlot(wide_name, TypeofMode::NOT_INSIDE_TYPEOF)
+      .LoadLookupSlot(wide_name, TypeofMode::INSIDE_TYPEOF)
+      .StoreLookupSlot(wide_name, LanguageMode::SLOPPY)
+      .StoreLookupSlot(wide_name, LanguageMode::STRICT);
+
   // CreateClosureWide
   Handle<SharedFunctionInfo> shared_info2 = factory->NewSharedFunctionInfo(
       factory->NewStringFromStaticChars("function_b"), MaybeHandle<Code>(),