Integrate LLVM at llvm/llvm-project@b2b7dbb47aa9

Updates LLVM usage to match
[b2b7dbb47aa9](https://github.com/llvm/llvm-project/commit/b2b7dbb47aa9)

PiperOrigin-RevId: 326003266

SUBMODULE_VERSIONS

diff --git a/SUBMODULE_VERSIONS b/SUBMODULE_VERSIONS
index 0751b7c..02ac1a5 100644
--- a/SUBMODULE_VERSIONS
+++ b/SUBMODULE_VERSIONS
@@ -4,7 +4,7 @@
 a5d9d0f7d368054fd1691aedf1db4116efcc233e third_party/flatbuffers
 4fb0ff7069bd88ee85902f4d0bb62794e5f6d021 third_party/flatcc
 f2fb48c3b3d79a75a88a99fba6576b25d42ec528 third_party/googletest
-0de60b550b727fa3a0202a9ab5ca30520e291dd5 third_party/llvm-project
+b2b7dbb47aa9aff1252d4440bb9986df5a7e67cb third_party/llvm-project
 17b12a4481daa150e2d1ea3ada086b551b856707 third_party/marl
 80885f899e12d55a45561ef758eea47bb340dbf1 third_party/mlir-emitc
 d8c7ee00a687ac369e62e2032514a93a9b413502 third_party/pybind11