Обнаружил подобную ошибку оптимизатора, отослал в Microsoft получил такой ответ:
«VS 2015 is not going to have any more bug fixes released, the hotfix you tried was a last effort to release fixes for some of the more ugly bugs exposed mostly by the new SSA Optimizer. I advise to move to VS 2017, especially since it’s binary compatible with 2015. There will also be some big improvements to the optimizer this year in the following VS 2017 updates.»
Правда, ошибка до сих пор воспроизводится и в VS 2017.
«VS 2015 is not going to have any more bug fixes released, the hotfix you tried was a last effort to release fixes for some of the more ugly bugs exposed mostly by the new SSA Optimizer. I advise to move to VS 2017, especially since it’s binary compatible with 2015. There will also be some big improvements to the optimizer this year in the following VS 2017 updates.»
Правда, ошибка до сих пор воспроизводится и в VS 2017.