[PATCH] D36619: [MachineCombine] Update instruction depths incrementally.

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

For reference, I also ran into this problem at one point, and came up with a hack to just turn off trace-based optimizations for long basic blocks.  This implementation looks nicer. :)


https://reviews.llvm.org/D36619