Bisected it:
41c0c2f42d8beb8d1e893a4bfb21d0cfae8b9b07 is the first new commit
commit 41c0c2f42d8beb8d1e893a4bfb21d0cfae8b9b07
Author: Jeff Bezanson <jeff.bezanson@gmail.com>
Date: Wed Jan 2 15:00:08 2019 -0500
don't use abstract_iteration for types with special cases in _apply (#30483)
(cherry picked from commit 3e6f60758fd9b974972a78bbe899bb754e97a533)
base/compiler/abstractinterpretation.jl | 23 +++++++++++++++++++----
1 file changed, 19 insertions(+), 4 deletions(-)
Tomorrow I will think about making a new issue or PR.