Integrate LLVM at llvm/llvm-project@df6d0579e18e

Updates LLVM usage to match
[df6d0579e18e](https://github.com/llvm/llvm-project/commit/df6d0579e18e)

PiperOrigin-RevId: 361855926
diff --git a/SUBMODULE_VERSIONS.txt b/SUBMODULE_VERSIONS.txt
index 45d992f..ca2bcfa 100644
--- a/SUBMODULE_VERSIONS.txt
+++ b/SUBMODULE_VERSIONS.txt
@@ -5,7 +5,7 @@
 b1fbd33c06cdb0024c67733c6fdec2009d17b384 third_party/googletest
 88b845dee001723c4a0db1fe5477de735b6d3bb0 third_party/liburing
 b37eeb3d993998dd4dd809064fe4cb7b9a2dfae8 third_party/llvm-bazel
-3f3f88fb95033b0461f14bc32b2d4267e06edba0 third_party/llvm-project
+df6d0579e18e868ef4b6e97794eacd5af86e1b8a third_party/llvm-project
 b57346cdc50296c0c498aaf20b116b0ff23cb68c third_party/mlir-emitc
 5be8be31b564e6fc3559a179cb85e08e78ae15ce third_party/mlir-hlo
 2b2bd45bbf9be04fd22ece5cc1f54679202e9257 third_party/pffft
diff --git a/third_party/llvm-project b/third_party/llvm-project
index 3f3f88f..df6d057 160000
--- a/third_party/llvm-project
+++ b/third_party/llvm-project
@@ -1 +1 @@
-Subproject commit 3f3f88fb95033b0461f14bc32b2d4267e06edba0
+Subproject commit df6d0579e18e868ef4b6e97794eacd5af86e1b8a