Recover and slightly improve perf of D144316 http://llvm-compile-time-tracker.com/compare.php?from=c23f29d6f05b1fe4fa2dd50cbb78ee2b30e0de4d&to=890888d8ac997395fef21ad4d9916f5780972f6d&stat=instructions%3Au

Recover and slightly improve perf of D144316 From parent (including D144316): http://llvm-compile-time-tracker.com/compare.php?from=a53d940cee6f281ef1a20d4f0fb39b23b4e98614&to=890888d8ac997395fef21ad4d9916f5780972f6d From D144316 parent: http://llvm-compile-time-tracker.com/compare.php?from=c23f29d6f05b1fe4fa2dd50cbb78ee2b30e0de4d&to=890888d8ac997395fef21ad4d9916f5780972f6d

Recover and slightly improve perf of D144316 From parent (including D144316): http://llvm-compile-time-tracker.com/compare.php?from=a53d940cee6f281ef1a20d4f0fb39b23b4e98614&to=890888d8ac997395fef21ad4d9916f5780972f6d From D144316 parent: http://llvm-compile-time-tracker.com/compare.php?from=c23f29d6f05b1fe4fa2dd50cbb78ee2b30e0de4d&to=890888d8ac997395fef21ad4d9916f5780972f6d&stat=instructions%3Au