[gardening] Fix test to pass along VM arguments to subprocess

If the test runs in AOT mode the executable is
`dart_precompiled_runtime` and the script is the AOT snapshot.

If the AOT snapshot was compiled with `--enable-assert` then the
subprocess has to be launched with the same flag.

TEST=Fixes current test failure in dartkp-weak-asserts-mac-release-simarm64 mode.

Change-Id: I69a17f9a355f8729e9047f98c920a5c7c2480293
Fixed: 3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/187920
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>

Author: mkustermann

tests/standalone/io/https_connection_closed_during_handshake_test.dart

@@ -50,8 +50,11 @@ void main(List<String> args) async {
 
   asyncStart();
 
-  final serverProcess = await Process.start(
-      Platform.executable, [Platform.script.toFilePath(), 'server']);
+  final serverProcess = await Process.start(Platform.executable, [
+    ...Platform.executableArguments,
+    Platform.script.toFilePath(),
+    'server'
+  ]);
   final serverPortCompleter = Completer<int>();
 
   serverProcess.stdout

tests/standalone_2/io/https_connection_closed_during_handshake_test.dart

@@ -47,10 +47,14 @@ void main(List<String> args) async {
     print('server: exiting');
     exit(1);
   }
+
   asyncStart();
 
-  final serverProcess = await Process.start(
-      Platform.executable, [Platform.script.toFilePath(), 'server']);
+  final serverProcess = await Process.start(Platform.executable, [
+    ...Platform.executableArguments,
+    Platform.script.toFilePath(),
+    'server'
+  ]);
   final serverPortCompleter = Completer<int>();
 
   serverProcess.stdout