opal/progress: use 32-bit atomics for call counter

This commit fixes a compile error on 32-bit platforms. The
low-priority call counter was always using 64-bit atomics which will
not work if 64-bit atomic math is not available. Updated to use 32-bit
instead.

Signed-off-by: Nathan Hjelm <[email protected]>

(cherry picked from commit dbd8369)

Signed-off-by: Nathan Hjelm <[email protected]>

Author: hjelmn

opal/runtime/opal_progress.c

@@ -186,7 +186,7 @@ opal_progress_finalize(void)
 void
 opal_progress(void)
 {
-    static volatile uint64_t num_calls = 0;
+    static volatile uint32_t num_calls = 0;
     size_t i;
     int events = 0;
 
@@ -225,7 +225,7 @@ opal_progress(void)
         events += (callbacks[i])();
     }
 
-    if ((OPAL_THREAD_ADD64((volatile int64_t *) &num_calls, 1) & callbacks_lp_mask) == 0) {
+    if ((OPAL_THREAD_ADD32((volatile int32_t *) &num_calls, 1) & callbacks_lp_mask) == 0) {
         /* run low priority callbacks once every 8 calls to opal_progress() */
         for (i = 0 ; i < callbacks_lp_len ; ++i) {
             events += (callbacks_lp[i])();