I tried my old patch for InstCombiner for shuffles, which was a handling for https://bugs.llvm.org//show_bug.cgi?id=30630. When I applied it a month ago, it produced nearly no change. But now I do see some files that needs this optimization, and I suspect it has to do with this revert.
I wonder what the status is on getting this reverted patch recommitted? Should I post my patch for InstCombiner on Phabricator?