Adds Simulator Longjmp and enables many tests for arm64.

runtime/vm/snapshot_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 
 #include "include/dart_debugger_api.h"
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
@@ skipping 816 matching lines @@
   void WriteScript(const Script& script) {
     WriteObject(script.raw());
     UnmarkAll();
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestSnapshotWriter);
 };
 
 
-// TODO(zra): Remove when tests are ready to enable.
-#if !defined(TARGET_ARCH_ARM64)
-
 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());
   TokenStream::Iterator expected_iterator(
       expected_tokens, 0, TokenStream::Iterator::kAllTokens);
   const String& str = String::Handle(expected_tokens.GenerateSource());
   const String& private_key = String::Handle(expected_tokens.PrivateKey());
   Scanner scanner(str, private_key);
@@ skipping 1862 matching lines @@
 
   result = Dart_RunLoop();
   EXPECT(Dart_IsError(result));
   EXPECT(Dart_ErrorHasException(result));
   EXPECT_SUBSTRING("Exception: nulltruefalse123456æøå3.14[]100123456789\n",
                    Dart_GetError(result));
 
   Dart_ExitScope();
 }
 
-#endif  // !defined(TARGET_ARCH_ARM64)
-
 }  // namespace dart