Fix set-but-unused variable warning

src/tests/cpu/sb_cpu.c

@@ -94,13 +94,8 @@ sb_event_t cpu_next_event(int thread_id)
  return req;
 }
 
-#if defined _MSC_VER && !defined __clang__
-/*
- MSVC would optimize away the whole function
- if optimizations are on.
-*/
-#pragma optimize("g", off)
-#endif
+/* helps to avoid compilers optimizing cpu_execute_event() away */
+static thread_local unsigned long long thread_count_primes;
 
 int cpu_execute_event(sb_event_t *r, int thread_id)
 {
@@ -123,14 +118,10 @@ int cpu_execute_event(sb_event_t *r, int thread_id)
  if (l > t )
  n++; 
  }
-
+ thread_count_primes= n;
  return 0;
 }
 
-#if defined _MSC_VER && !defined __clang__
-#pragma optimize("", on)
-#endif
-
 void cpu_print_mode(void)
 {
  log_text(LOG_INFO, "Doing CPU performance benchmark\n");