[Parser] Introduce AstStringConstants to share constants across AstValueFactory

test/cctest/test-ast.cc

Index: test/cctest/test-ast.cc
diff --git a/test/cctest/test-ast.cc b/test/cctest/test-ast.cc
index 99cbb950ca27cb040ab3ff30f7ad3ce03dd040f3..c027e88a525ac84b6e27be4d41ca0339a46b1ebe 100644
--- a/test/cctest/test-ast.cc
+++ b/test/cctest/test-ast.cc
@@ -30,6 +30,7 @@
 #include "src/v8.h"
 
 #include "src/ast/ast.h"
+#include "src/isolate.h"
 #include "src/objects-inl.h"
 #include "src/zone/accounting-allocator.h"
 #include "test/cctest/cctest.h"
@@ -37,12 +38,16 @@
 using namespace v8::internal;
 
 TEST(List) {
+  v8::V8::Initialize();
+  Isolate* isolate = CcTest::i_isolate();
+
   List<AstNode*>* list = new List<AstNode*>(0);
   CHECK_EQ(0, list->length());
 
   v8::internal::AccountingAllocator allocator;
   Zone zone(&allocator, ZONE_NAME);
-  AstValueFactory value_factory(&zone, 0);
+  AstValueFactory value_factory(&zone, isolate->ast_string_constants(),
+                                isolate->heap()->HashSeed());
   AstNodeFactory factory(&value_factory);
   AstNode* node = factory.NewEmptyStatement(kNoSourcePosition);
   list->Add(node);