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, 14 deletions

diff --git a/erts/emulator/beam/erl_message.h b/erts/emulator/beam/erl_message.h
index 42ed14e69c..1f95ffaa5a 100644
--- a/erts/emulator/beam/erl_message.h
+++ b/erts/emulator/beam/erl_message.h
@@ -174,7 +174,6 @@ typedef struct {
     ErtsMessage** saved_last;	/* saved last pointer */
 } ErlMessageQueue;
 
-#ifdef ERTS_SMP
 
 typedef struct {
     ErtsMessage* first;
@@ -190,7 +189,6 @@ typedef struct erl_trace_message_queue__ {
     Sint len;            /* queue length */
 } ErlTraceMessageQueue;
 
-#endif
 
 /* Get "current" message */
 #define PEEK_MESSAGE(p)  (*(p)->msg.save)
@@ -207,7 +205,6 @@ typedef struct erl_trace_message_queue__ {
         (p)->where.len += (num_msgs);                                   \
     } while(0)
 
-#ifdef ERTS_SMP
 
 /* Add message last in private message queue */
 #define LINK_MESSAGE_PRIVQ(p, first_msg, last_msg, len)                 \
@@ -231,17 +228,6 @@ typedef struct erl_trace_message_queue__ {
         }                                               \
     } while (0)
 
-#else
-
-#define ERTS_SMP_MSGQ_MV_INQ2PRIVQ(p)
-
-/* Add message last_msg in message queue */
-#define LINK_MESSAGE(p, first_msg, last_msg, len)                       \
-    do {                                                                \
-        LINK_MESSAGE_IMPL(p, first_msg, last_msg, len, msg);            \
-    } while(0)
-
-#endif
 
 /* Unlink current message */
 #define UNLINK_MESSAGE(p,msgp) do { \