sendandexit_test requires enable-isolate-groups, is not compatible with hotreload bots

[aam]

/===================================================================\
| vm/dart/sendandexit_test is new and failed (Crash, expected Pass) |
\===================================================================/

--- Command "vm" (took 03.000829s):
DART_CONFIGURATION=ReleaseX64 out/ReleaseX64/dart --hot-reload-rollback-test-mode --enable-isolate-groups --ignore-unrecognized-flags --packages=/b/s/w/ir/.packages /b/s/w/ir/runtime/tests/vm/dart/sendandexit_test.dart

exit code:
-6

stderr:
../../runtime/vm/isolate.cc: 1747: error: expected: !FLAG_enable_isolate_groups
version=2.9.0-edge.17654b70d720917cfd3c222dba85e21ac67a2353 (be) (Wed Apr 22 17:34:09 2020 +0000) on "linux_x64"
pid=23535, thread=23535, isolate=main(0x5619b4656900)
isolate_instructions=5619b2ede320, vm_instructions=5619b2ede320
  pc 0x00005619b31b07fc fp 0x00007ffe5e5b01f0 dart::Profiler::DumpStackTrace(void*)+0x7c
  pc 0x00005619b2ede452 fp 0x00007ffe5e5b02d0 dart::Assert::Fail(char const*, ...)+0x82
  pc 0x00005619b3100544 fp 0x00007ffe5e5b0380 out/ReleaseX64/dart+0x1a54544
  pc 0x00005619b32006db fp 0x00007ffe5e5b0570 dart::DRT_StackOverflow(dart::NativeArguments)+0x66b
  pc 0x00007f65808812b8 fp 0x00007ffe5e5b05b0 Unknown symbol
  pc 0x00007f657fca50f0 fp 0x00007ffe5e5b05d8 Unknown symbol
  pc 0x00007f658088174c fp 0x00007ffe5e5b0648 Unknown symbol
  pc 0x00005619b30c3e02 fp 0x00007ffe5e5b06e0 dart::DartEntry::InvokeCode(dart::Code const&, dart::Array const&, dart::Array const&, dart::Thread*)+0x112
  pc 0x00005619b30c3b69 fp 0x00007ffe5e5b0770 dart::DartEntry::InvokeFunction(dart::Function const&, dart::Array const&, dart::Array const&, unsigned long)+0x2e9
  pc 0x00005619b316ce39 fp 0x00007ffe5e5b07e0 dart::Library::Invoke(dart::String const&, dart::Array const&, dart::Array const&, bool, bool) const+0x279
  pc 0x00005619b3640f87 fp 0x00007ffe5e5b08c0 Dart_Invoke+0x5d7
  pc 0x00005619b2ec886a fp 0x00007ffe5e5b0950 dart::bin::RunMainIsolate(char const*, dart::bin::CommandLineOptions*)+0x39a
  pc 0x00005619b2ec9678 fp 0x00007ffe5e5b0a60 dart::bin::main(int, char**)+0x468
  pc 0x00005619b2eca0cd fp 0x00007ffe5e5b0a80 main+0xd
-- End of DumpStackTrace
[exit     : sp(0) fp(0x7ffe5e5b05b0) pc(0)]
[dart     : sp(0x7ffe5e5b05c0) fp(0x7ffe5e5b05d8) pc(0x7f657fca50f0) dart:isolate_::__startMainIsolate@1026248 ]
[entry    : sp(0x7ffe5e5b05e8) fp(0x7ffe5e5b0648) pc(0x7f658088174c)]

--- Re-run this test:
python tools/test.py -n dartk-reload-rollback-linux-release-x64 vm/dart/sendandexit_test

[maks]

I'm seeing this with current master too, but I am guessing this is temporary while @mkustermann is doing the work on #36097 ?

But whats more troubling is that per what I filed in #44640 even without isolate-groups hot-reload appears to be broken for spawned isolates.

[mkustermann]

Correct, JIT support is still in-progress and hot-reload and a few other things are not yet implemented.