[llvm] [VPlan] Strip pred-block check in inLoopReductions (NFC) (PR #194086)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `flang-aarch64-libcxx` running on `linaro-flang-aarch64-libcxx` while building `llvm` at step 5 "cmake-configure".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/89/builds/34667

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

```
Step 5 (cmake-configure) failure: cmake (failure)
...
-- Could NOT find OCaml (missing: OCAMLFIND OCAML_VERSION OCAML_STDLIB_PATH) 
-- Could NOT find OCaml (missing: OCAMLFIND OCAML_VERSION OCAML_STDLIB_PATH) 
-- OCaml bindings disabled.
-- LLVM default target triple: aarch64-unknown-linux-gnu
-- Building with -fPIC
-- Precompiled headers enabled.
-- Targeting AArch64
-- Searching for ocloc
-- ocloc not found
CMake Warning at /home/tcwg-buildbot/worker/flang-aarch64-libcxx/llvm-project/mlir/lib/Target/LLVM/CMakeLists.txt:246 (message):
  ocloc not found, MLIRXeVMTarget will not be able to use ocloc for native
  binary compilation.


-- Clang version: 23.0.0git
-- Found Python3: /usr/bin/python3.10 (found version "3.10.12") found components: Interpreter 
-- Registering ExampleIRTransforms as a pass plugin (static build: OFF)
-- Registering Bye as a pass plugin (static build: OFF)
-- Google Benchmark version: v0.0.0, normalized to 0.0.0
-- Enabling additional flags: -DINCLUDE_DIRECTORIES=/home/tcwg-buildbot/worker/flang-aarch64-libcxx/llvm-project/third-party/benchmark/include
-- Performing Test HAVE_THREAD_SAFETY_ATTRIBUTES -- success
-- Performing Test HAVE_GNU_POSIX_REGEX -- failed to compile
-- Performing Test HAVE_POSIX_REGEX -- success
-- Performing Test HAVE_STEADY_CLOCK -- success
-- Performing Test HAVE_PTHREAD_AFFINITY -- success
-- Configuring done (20.4s)
-- Generating done (18.6s)
CMake Error:
  Running

   '/usr/local/bin/ninja' '-C' '/home/tcwg-buildbot/worker/flang-aarch64-libcxx/build_llvm' '-t' 'recompact'

  failed with:

   ninja: error: failed recompaction: No space left on device



CMake Error:
  Running

   '/usr/local/bin/ninja' '-C' '/home/tcwg-buildbot/worker/flang-aarch64-libcxx/build_llvm' '-t' 'restat' 'build.ninja'

  failed with:

   ninja: error: failed recompaction: No space left on device



CMake Generate step failed.  Build files cannot be regenerated correctly.

```

</details>

https://github.com/llvm/llvm-project/pull/194086