5045 use atomic_{inc,dec}_* instead of atomic_add_*

*** 307,319 ****
  
          if (lvp->lv_base_va != NULL) {
                  vmem_xfree(is_64bit ? lib_va_64_arena : lib_va_32_arena,
                      lvp->lv_base_va, lvp->lv_len);
                  if (is_64bit) {
!                         atomic_add_32(&libs_mapped_64, -1);
                  } else {
!                         atomic_add_32(&libs_mapped_32, -1);
                  }
          }
          kmem_free(lvp, sizeof (struct lib_va));
  }
  
--- 307,319 ----
  
          if (lvp->lv_base_va != NULL) {
                  vmem_xfree(is_64bit ? lib_va_64_arena : lib_va_32_arena,
                      lvp->lv_base_va, lvp->lv_len);
                  if (is_64bit) {
!                         atomic_dec_32(&libs_mapped_64);
                  } else {
!                         atomic_dec_32(&libs_mapped_32);
                  }
          }
          kmem_free(lvp, sizeof (struct lib_va));
  }
  
*** 470,483 ****
                  lvp->lv_flags = LV_ELF32;
          }
  
          if (base_va != NULL) {
                  if (model == DATAMODEL_LP64) {
!                         atomic_add_32(&libs_mapped_64, 1);
                  } else {
                          ASSERT(model == DATAMODEL_ILP32);
!                         atomic_add_32(&libs_mapped_32, 1);
                  }
          }
          ASSERT(*tmp == NULL);
          *tmp = lvp;
          mutex_exit(LIB_VA_HASH_MUTEX(index));
--- 470,483 ----
                  lvp->lv_flags = LV_ELF32;
          }
  
          if (base_va != NULL) {
                  if (model == DATAMODEL_LP64) {
!                         atomic_inc_32(&libs_mapped_64);
                  } else {
                          ASSERT(model == DATAMODEL_ILP32);
!                         atomic_inc_32(&libs_mapped_32);
                  }
          }
          ASSERT(*tmp == NULL);
          *tmp = lvp;
          mutex_exit(LIB_VA_HASH_MUTEX(index));