Add script context with context-allocated "const this"

test/unittests/compiler/js-type-feedback-unittest.cc

Index: test/unittests/compiler/js-type-feedback-unittest.cc
diff --git a/test/unittests/compiler/js-type-feedback-unittest.cc b/test/unittests/compiler/js-type-feedback-unittest.cc
index 7737cfeeed72d68cc03350c47aa70113fe3eb1d8..bb257cb0a5f5ee3085f203a2d8e25951e1eb5235 100644
--- a/test/unittests/compiler/js-type-feedback-unittest.cc
+++ b/test/unittests/compiler/js-type-feedback-unittest.cc
@@ -83,7 +83,7 @@ class JSTypeFeedbackTest : public TypedGraphTest {
     Node* context = UndefinedConstant();
 
     Unique<Name> name = Unique<Name>::CreateUninitialized(
-        isolate()->factory()->NewStringFromAsciiChecked(string));
+        isolate()->factory()->InternalizeUtf8String(string));
     const Operator* op = javascript()->LoadNamed(name, feedback);
     Node* load = graph()->NewNode(op, global, vector, context);
     if (mode == JSTypeFeedbackSpecializer::kDeoptimizationEnabled) {