Update LLVM to llvm/llvm-project@3f136f7 (iree-org#19479)

Carrying the following reverts

- llvm/llvm-project#116470
- llvm/llvm-project#117424
- llvm/llvm-project#119671

First two are carry over from previous integrate. It is being fixed in
iree-org#19451 . The last one is a new
failure.

---------

Signed-off-by: MaheshRavishankar <mahesh.ravishankar@gmail.com>