LLVM Integrate@6cc18a8e4338

[amd-eochoalo]

Reverts carried forward:

• Local revert of Reland "Redesign Straight-Line Strength Reduction (SLSR) (#162930)" llvm/llvm-project#169614 due to resnet50-v2-7 test is flaky on gfx1100 #22649

Reverts dropped:

• Revert [mlir][Interfaces][NFC] Simplify and align RegionSuccessor design / API llvm/llvm-project#174945 (torch also updated accordingly)

Also includes torch integrate.

Non-trivial changes include changes to the RegionSuccessor API.

[amd-eochoalo]

• The failing test_w7900 are the usual failing tests.
• The failing test_mi250 are relatively new. But they depend on the runner. One can see another failure in another unrelated PR here: https://github.com/iree-org/iree/actions/runs/21224680272/job/61069079131 I've tracked it down a bit, and it seems to be related to runner iree-mi250 and file permissions.

Cleaning the repository
  /usr/bin/git clean -ffdx
  warning: failed to remove .packages/iree_base_compiler-3.10.0.dev0+a66c7ca0012bfa26b52b304f99842860733abba3-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl: Permission denied
  // continues for many lines and fails this command

Please note that this runner has had successful runs in the past. Most recently (this one last week) https://github.com/iree-org/iree/actions/runs/21054410358/job/60547777265

There's also another successful run but what is interesting is that it has a different sequence of Github action steps: https://github.com/iree-org/iree/actions/runs/21215994674/job/61038121508 . Notice intialize containers is the second step here while on this one, the second setp is to checkout repository