[llvm] [LV] Remove EpilogueLoopVectorizationInfo::EpilogueUF (NFC). (PR #226792)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-flang-rhel-clang` running on `ppc64le-flang-rhel-test` while building `llvm` at step 6 "test-build-unified-tree-check-flang".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/157/builds/51429

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-flang) failure: 1200 seconds without output running [b'ninja', b'check-flang'], attempting to kill
...
PASS: Flang :: Lower/math-lowering/log.f90 (5125 of 5136)
PASS: Flang :: Lower/math-lowering/log10.f90 (5126 of 5136)
PASS: Flang :: Lower/math-lowering/sin.f90 (5127 of 5136)
PASS: Flang :: Lower/math-lowering/sinh.f90 (5128 of 5136)
PASS: Flang :: Lower/split-sum-expression-tree-lowering.f90 (5129 of 5136)
PASS: Flang :: Lower/split-sum-expression-tree-subscripts.f90 (5130 of 5136)
PASS: Flang :: Semantics/numeric_storage_size_only.f90 (5131 of 5136)
PASS: Flang :: Semantics/offsets01.f90 (5132 of 5136)
PASS: Flang :: Lower/OpenMP/rtl-flags.f90 (5133 of 5136)
PASS: Flang :: Lower/OpenMP/same_var_first_lastprivate.f90 (5134 of 5136)
command timed out: 1200 seconds without output running [b'ninja', b'check-flang'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=3746.881890

```

</details>

https://github.com/llvm/llvm-project/pull/226792