patch as-lock-macro-simplification

*** 139,149 ****
                   * Since we can't return less than the current break,
                   * initialize the return value to the current break
                   */
                  retval = (long)brkend;
  
!                 AS_LOCK_ENTER(as, &as->a_lock, RW_READER);
                  for (seg = as_findseg(as, brkend, 0); seg != NULL;
                      seg = AS_SEGNEXT(as, seg)) {
                          if (seg->s_base >= brkend) {
                                  nextseg = seg;
                                  break;
--- 139,149 ----
                   * Since we can't return less than the current break,
                   * initialize the return value to the current break
                   */
                  retval = (long)brkend;
  
!                 AS_LOCK_ENTER(as, RW_READER);
                  for (seg = as_findseg(as, brkend, 0); seg != NULL;
                      seg = AS_SEGNEXT(as, seg)) {
                          if (seg->s_base >= brkend) {
                                  nextseg = seg;
                                  break;
*** 210,220 ****
                          if (as->a_userlimit - brkendpg > size)
                                  retval = MIN((size_t)retval,
                                      (size_t)(brkendpg + size));
                  }
  
!                 AS_LOCK_EXIT(as, &as->a_lock);
  
                  /* truncate to same boundary as sbrk */
  
                  switch (get_udatamodel()) {
                  default:
--- 210,220 ----
                          if (as->a_userlimit - brkendpg > size)
                                  retval = MIN((size_t)retval,
                                      (size_t)(brkendpg + size));
                  }
  
!                 AS_LOCK_EXIT(as);
  
                  /* truncate to same boundary as sbrk */
  
                  switch (get_udatamodel()) {
                  default: