* Revert " Optimize ‘hist’ for multi-core CPU (#4529)" This reverts commit 4d6590be3c9a043d44d9e4fe0a456a9f8179ec72. * Fix build
* Revert " Optimize ‘hist’ for multi-core CPU (#4529)" This reverts commit 4d6590be3c9a043d44d9e4fe0a456a9f8179ec72. * Fix build