erts: Remove ERTS_SMP and USE_THREAD defines

This refactor was done using the unifdef tool like this:
    for file in $(find erts/ -name *.[ch]); do unifdef -t -f defile -o $file $file; done

where defile contained:
    #define ERTS_SMP 1
    #define USE_THREADS 1
    #define DDLL_SMP 1
    #define ERTS_HAVE_SMP_EMU 1
    #define SMP 1
    #define ERL_BITS_REENTRANT 1
    #define ERTS_USE_ASYNC_READY_Q 1
    #define FDBLOCK 1
    #undef ERTS_POLL_NEED_ASYNC_INTERRUPT_SUPPORT
    #define ERTS_POLL_ASYNC_INTERRUPT_SUPPORT 0
    #define ERTS_POLL_USE_WAKEUP_PIPE 1
    #define ERTS_POLL_USE_UPDATE_REQUESTS_QUEUE 1
    #undef ERTS_HAVE_PLAIN_EMU
    #undef ERTS_SIGNAL_STATE

1 files changed, 0 insertions, 2 deletions

diff --git a/erts/emulator/beam/code_ix.c b/erts/emulator/beam/code_ix.c
index 8a3d1b20b4..ba68d612e3 100644
--- a/erts/emulator/beam/code_ix.c
+++ b/erts/emulator/beam/code_ix.c
@@ -115,9 +115,7 @@ void erts_abort_staging_code_ix(void)
 int erts_try_seize_code_write_permission(Process* c_p)
 {
     int success;
-#ifdef ERTS_SMP
     ASSERT(!erts_smp_thr_progress_is_blocking()); /* to avoid deadlock */
-#endif
     ASSERT(c_p != NULL);
 
     erts_smp_mtx_lock(&code_write_permission_mtx);