Integrate LLVM at llvm/llvm-project@b5426ced7128

Updates LLVM usage to match
[b5426ced7128](https://github.com/llvm/llvm-project/commit/b5426ced7128)

PiperOrigin-RevId: 403098275

SUBMODULE_VERSIONS.txt

diff --git a/SUBMODULE_VERSIONS.txt b/SUBMODULE_VERSIONS.txt
index fcc6f5a..3e3f622 100644
--- a/SUBMODULE_VERSIONS.txt
+++ b/SUBMODULE_VERSIONS.txt
@@ -4,7 +4,7 @@
 aa533abfd4232b01f9e57041d70114d5a77e6de0 third_party/googletest
 88b845dee001723c4a0db1fe5477de735b6d3bb0 third_party/liburing
 acd6f6f014c25e46363e718381e0b35205df2d83 third_party/libyaml
-a8f69be61fc8892db50b7e37707915ece0344452 third_party/llvm-project
+b5426ced71280c340b005acc661e0778541800a5 third_party/llvm-project
 d343113a490691716eac87db61d77b07a7304436 third_party/mlir-hlo
 3f701faace7addc75d16dea8a6cd769fa5b3f260 third_party/musl
 4c7697dbe973ed01ae6fbec37d186ebd05982e1f third_party/pybind11

third_party/llvm-project

diff --git a/third_party/llvm-project b/third_party/llvm-project
index a8f69be..b5426ce 160000
--- a/third_party/llvm-project
+++ b/third_party/llvm-project
@@ -1 +1 @@
-Subproject commit a8f69be61fc8892db50b7e37707915ece0344452
+Subproject commit b5426ced71280c340b005acc661e0778541800a5