Add a mode to completely deserialize scope chains

test/cctest/test-parsing.cc

Index: test/cctest/test-parsing.cc
diff --git a/test/cctest/test-parsing.cc b/test/cctest/test-parsing.cc
index 656458962a42094ecb7ca2a2985f7046369a6d7f..cdfb77d654b96fff0b38732c569a17593c5dd7e5 100644
--- a/test/cctest/test-parsing.cc
+++ b/test/cctest/test-parsing.cc
@@ -3396,8 +3396,9 @@ TEST(SerializationOfMaybeAssignmentFlag) {
   CHECK(str->IsInternalizedString());
   i::Scope* script_scope =
       new (&zone) i::Scope(&zone, nullptr, i::SCRIPT_SCOPE);
-  i::Scope* s = i::Scope::DeserializeScopeChain(isolate, &zone, context,
-                                                script_scope, &avf);
+  i::Scope* s = i::Scope::DeserializeScopeChain(
+      isolate, &zone, context, script_scope, &avf,
+      i::Scope::DeserializationMode::kKeepScopeInfo);
   CHECK(s != script_scope);
   CHECK(name != NULL);
 
@@ -3443,8 +3444,9 @@ TEST(IfArgumentsArrayAccessedThenParametersMaybeAssigned) {
 
   i::Scope* script_scope =
       new (&zone) i::Scope(&zone, nullptr, i::SCRIPT_SCOPE);
-  i::Scope* s = i::Scope::DeserializeScopeChain(isolate, &zone, context,
-                                                script_scope, &avf);
+  i::Scope* s = i::Scope::DeserializeScopeChain(
+      isolate, &zone, context, script_scope, &avf,
+      i::Scope::DeserializationMode::kKeepScopeInfo);
   CHECK(s != script_scope);
   const i::AstRawString* name_x = avf.GetOneByteString("x");