Minor cleanup based on profiler output of CompileParseFunction.

runtime/vm/snapshot_test.cc

Index: runtime/vm/snapshot_test.cc
diff --git a/runtime/vm/snapshot_test.cc b/runtime/vm/snapshot_test.cc
index ef7a10cfcc4ba283caffac486b9d9600604f0408..3bc4561bfc3d0072d8017ed6c0d11b1a40dcfcea 100644
--- a/runtime/vm/snapshot_test.cc
+++ b/runtime/vm/snapshot_test.cc
@@ -859,27 +859,32 @@ static void GenerateSourceAndCheck(const Script& script) {
   // Check if we are able to generate the source from the token stream.
   // Rescan this source and compare the token stream to see if they are
   // the same.
-  const TokenStream& expected_tokens = TokenStream::Handle(script.tokens());
+  Zone* zone = Thread::Current()->zone();
+  const TokenStream& expected_tokens =
+      TokenStream::Handle(zone, script.tokens());
   TokenStream::Iterator expected_iterator(
+      zone,
       expected_tokens,
       TokenPosition::kMinSource,
       TokenStream::Iterator::kAllTokens);
-  const String& str = String::Handle(expected_tokens.GenerateSource());
-  const String& private_key = String::Handle(expected_tokens.PrivateKey());
+  const String& str = String::Handle(zone, expected_tokens.GenerateSource());
+  const String& private_key =
+      String::Handle(zone, expected_tokens.PrivateKey());
   Scanner scanner(str, private_key);
   const TokenStream& reconstructed_tokens =
-      TokenStream::Handle(TokenStream::New(scanner.GetStream(),
-                                           private_key,
-                                           false));
+      TokenStream::Handle(zone, TokenStream::New(scanner.GetStream(),
+                                                 private_key,
+                                                 false));
   expected_iterator.SetCurrentPosition(TokenPosition::kMinSource);
   TokenStream::Iterator reconstructed_iterator(
+      zone,
       reconstructed_tokens,
       TokenPosition::kMinSource,
       TokenStream::Iterator::kAllTokens);
   Token::Kind expected_kind = expected_iterator.CurrentTokenKind();
   Token::Kind reconstructed_kind = reconstructed_iterator.CurrentTokenKind();
-  String& expected_literal = String::Handle();
-  String& actual_literal = String::Handle();
+  String& expected_literal = String::Handle(zone);
+  String& actual_literal = String::Handle(zone);
   while (expected_kind != Token::kEOS && reconstructed_kind != Token::kEOS) {
     EXPECT_EQ(expected_kind, reconstructed_kind);
     expected_literal ^= expected_iterator.CurrentLiteral();
@@ -937,13 +942,14 @@ TEST_CASE(SerializeScript) {
       "  }\n"
       "}\n";
 
-  String& url = String::Handle(String::New("dart-test:SerializeScript"));
-  String& source = String::Handle(String::New(kScriptChars));
-  Script& script = Script::Handle(Script::New(url,
-                                              source,
-                                              RawScript::kScriptTag));
-  const String& lib_url = String::Handle(Symbols::New(thread, "TestLib"));
-  Library& lib = Library::Handle(Library::New(lib_url));
+  Zone* zone = thread->zone();
+  String& url = String::Handle(zone, String::New("dart-test:SerializeScript"));
+  String& source = String::Handle(zone, String::New(kScriptChars));
+  Script& script = Script::Handle(zone, Script::New(url,
+                                                    source,
+                                                    RawScript::kScriptTag));
+  const String& lib_url = String::Handle(zone, Symbols::New(thread, "TestLib"));
+  Library& lib = Library::Handle(zone, Library::New(lib_url));
   lib.Register();
   EXPECT(CompilerTest::TestCompileScript(lib, script));
 
@@ -954,27 +960,30 @@ TEST_CASE(SerializeScript) {
 
   // Read object back from the snapshot.
   ScriptSnapshotReader reader(buffer, writer.BytesWritten(), thread);
-  Script& serialized_script = Script::Handle(thread->zone());
+  Script& serialized_script = Script::Handle(zone);
   serialized_script ^= reader.ReadObject();
 
   // Check if the serialized script object matches the original script.
-  String& expected_literal = String::Handle();
-  String& actual_literal = String::Handle();
-  String& str = String::Handle();
+  String& expected_literal = String::Handle(zone);
+  String& actual_literal = String::Handle(zone);
+  String& str = String::Handle(zone);
   str ^= serialized_script.url();
   EXPECT(url.Equals(str));
 
-  const TokenStream& expected_tokens = TokenStream::Handle(script.tokens());
+  const TokenStream& expected_tokens =
+      TokenStream::Handle(zone, script.tokens());
   const TokenStream& serialized_tokens =
-      TokenStream::Handle(serialized_script.tokens());
+      TokenStream::Handle(zone, serialized_script.tokens());
   const ExternalTypedData& expected_data =
-      ExternalTypedData::Handle(expected_tokens.GetStream());
+      ExternalTypedData::Handle(zone, expected_tokens.GetStream());
   const ExternalTypedData& serialized_data =
-      ExternalTypedData::Handle(serialized_tokens.GetStream());
+      ExternalTypedData::Handle(zone, serialized_tokens.GetStream());
   EXPECT_EQ(expected_data.Length(), serialized_data.Length());
-  TokenStream::Iterator expected_iterator(expected_tokens,
+  TokenStream::Iterator expected_iterator(zone,
+                                          expected_tokens,
                                           TokenPosition::kMinSource);
-  TokenStream::Iterator serialized_iterator(serialized_tokens,
+  TokenStream::Iterator serialized_iterator(zone,
+                                            serialized_tokens,
                                             TokenPosition::kMinSource);
   Token::Kind expected_kind = expected_iterator.CurrentTokenKind();
   Token::Kind serialized_kind = serialized_iterator.CurrentTokenKind();