Integrates/llvm@4b00302c99e0. (#24047)

Still carrying local reverts:

-
https://github.com/iree-org/llvm-project/commit/12d53fd227f353e20e5b2c83037f8f6a19262590
  - Drop after torch-mlir bumps LLVM
-
https://github.com/iree-org/llvm-project/commit/fd32048b7e1991ffbad05dcacf6b628b6f0cefca
  - Drop after StableHLO bumps LLVM

Made-with: Cursor

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

third_party/llvm-project

diff --git a/third_party/llvm-project b/third_party/llvm-project
index 214b3ab..4fd6a8a 160000
--- a/third_party/llvm-project
+++ b/third_party/llvm-project
@@ -1 +1 @@
-Subproject commit 214b3ab040e10e06ff000cbda155c0aa9bdd9fe4
+Subproject commit 4fd6a8a2afd7250b9a89acba8cbbec7e6d22cde6