test_thread.rb (test_thread_interrupt_for_killed_thread): reprieve for MJIT

With MJIT enabled, the exit (from SIGTERM) may take a long time
to complete.  Prevent EnvUtil.invoke_ruby from falling back to
other signals (SIGABRT) when Process.wait takes longer than the
default 1s reprieve.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63794 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_thread.rb

@@ -1286,7 +1286,12 @@ q.pop
   end
 
   def test_thread_interrupt_for_killed_thread
-    assert_normal_exit(<<-_end, '[Bug #8996]', timeout: 5, timeout_error: nil)
+    opts = { timeout: 5, timeout_error: nil }
+
+    # prevent SIGABRT from slow shutdown with MJIT
+    opts[:reprieve] = 3 if RubyVM::MJIT.enabled?
+
+    assert_normal_exit(<<-_end, '[Bug #8996]', opts)
       Thread.report_on_exception = false
       trap(:TERM){exit}
       while true