message: Integrate LLVM at llvm/llvm-project@fec294599894
  Updates LLVM usage to match
  [fec294599894](https://github.com/llvm/llvm-project/commit/fec294599894)
diff: @@ -4,8 +4,8 @@ load("//third_party:repo.bzl", "tf_http_archive")
  def repo(name):
  """Imports LLVM."""
  - LLVM_COMMIT = "df47368d406aa4b9aaa7dd49026a0eff9763e6ca"
  - LLVM_SHA256 = "b46f7a7cd25026ae8e26777473104ac0b6a1e99c318312d98093708d65470321"
  + LLVM_COMMIT = "fec2945998947f04d672e9c5f33b57f7177474c0"
  + LLVM_SHA256 = "b3ddaa6af7142d2a34c2b0b529badbf57ce8a606de7660058f18e9f770f3b2a7"
  tf_http_archive(
  name = name,
  