disable STM Thread test under bytecode

Author: jmid

src/neg_tests/dune

@@ -8,7 +8,7 @@
    ;; STM tests
    stm_tests_sequential_ref.exe
    stm_tests_domain_ref.exe
-   stm_tests_thread_ref.exe
+   stm_tests_thread_ref.exe ;; currently disabled under bytecode mode
    stm_tests_conclist.exe
    ;; Lin tests
    lin_tests_domain.exe ;; currently not run on CI

src/neg_tests/stm_tests_thread_ref.ml

@@ -3,6 +3,10 @@ open Stm_tests_spec_ref
 module RT_int   = STM_thread.Make(RConf_int)
 module RT_int64 = STM_thread.Make(RConf_int64)
 ;;
+if Sys.backend_type = Sys.Bytecode
+then
+  Printf.printf "STM ref tests with Thread disabled under bytecode\n\n%!"
+else
 QCheck_runner.run_tests_main
   (let count = 1000 in
    [RT_int.agree_test_conc       ~count ~name:"STM int ref test with Thread";