regression/ck_spinlock: Move the redefine of CORES before its first usage.

Redefine CORES to 2 if it was < 2 before its first usage in LOCK_DEFINE.
While harmless, it is confusing.

regressions/ck_spinlock/ck_hclh.h

@@ -1,12 +1,14 @@
 #define MAX(a,b) ((a) > (b) ? (a) : (b))
-#define LOCK_NAME "ck_clh"
-#define LOCK_DEFINE static ck_spinlock_hclh_t CK_CC_CACHELINE *glob_lock; \
-		    static ck_spinlock_hclh_t CK_CC_CACHELINE *local_lock[CORES / 2]
+
 #if CORES < 2
 #undef CORES
 #define CORES 2
 #endif
 
+#define LOCK_NAME "ck_clh"
+#define LOCK_DEFINE static ck_spinlock_hclh_t CK_CC_CACHELINE *glob_lock; \
+		    static ck_spinlock_hclh_t CK_CC_CACHELINE *local_lock[CORES / 2]
+
 #define LOCK_STATE ck_spinlock_hclh_t *na = malloc(MAX(sizeof(ck_spinlock_hclh_t), 64))
 #define LOCK ck_spinlock_hclh_lock(&glob_lock, &local_lock[(core % CORES) / 2], na)
 #define UNLOCK ck_spinlock_hclh_unlock(&na)