Integrate llvm-project to 15e46e25f26c. (#24077)

No reverts.

Clean bump.

Note (keep note alive):
- We are carrying a patch in iree-org/torch-mlir that needs to be 1)
removed once they have an LLVM bump and 2) cherry-picked any time a
torch-mlir bump is performed.
-
iree-org/torch-mlir@172a8b4

Made-with: Cursor

Signed-off-by: Muzammiluddin Syed <muzasyed@amd.com>

Author: Muzammiluddin-Syed-ECE