commit 3b739a58191fabc140ae0b018bdc09d862a2c322
author Roman Lebedev <lebedev.ri@gmail.com> Wed Apr 07 11:04:57 2021 +0300
committer Copybara-Service <copybara-worker@google.com> Mon Apr 12 11:08:01 2021 -0700
tree e8eafc5d9c92c4568e1757e79cc67f68993ffd58
parent c6f425fc435e91680142f7f41754a29e9580e3d4

Reland [InstCombine] Fold `((X - Y) - Z)` to `X - (Y + Z)` (PR49858)

This reverts commit a547b4e26b311e417cd51100e379693f51a3f448,
relanding commit 31d219d2997fed1b7dc97e0adf170d5aaf65883e,
which was reverted because there was a conflicting inverse transform,
which was causing an endless combine loop, which has now been adjusted.

Original commit message:

https://alive2.llvm.org/ce/z/67w-wQ

We prefer `add`s over `sub`, and this particular xform
allows further folds to happen:

Fixes https://bugs.llvm.org/show_bug.cgi?id=49858

GitOrigin-RevId: 2829094a8e252d04f13aabdf6f416c42a06af695