[llvm] [X86] combineConcatVectorOps - recursively call combineConcatVectorOps instead of predicting when ops will freely concat (PR #130275)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-win-fast` running on `as-builder-3` while building `llvm` at step 7 "test-build-unified-tree-check-llvm-unit".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/2/builds/18777

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

```
Step 7 (test-build-unified-tree-check-llvm-unit) failure: test (failure)
******************** TEST 'LLVM-Unit :: Support/./SupportTests.exe/49/86' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:C:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\build\unittests\Support\.\SupportTests.exe-LLVM-Unit-1468-49-86.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=86 GTEST_SHARD_INDEX=49 C:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\build\unittests\Support\.\SupportTests.exe
--

Script:
--
C:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\build\unittests\Support\.\SupportTests.exe --gtest_filter=Caching.NoCommit
--
C:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\llvm-project\llvm\unittests\Support\Caching.cpp(142): error: Value of: AddStream
  Actual: false
Expected: true


C:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\llvm-project\llvm\unittests\Support\Caching.cpp:142
Value of: AddStream
  Actual: false
Expected: true



********************


```

</details>

https://github.com/llvm/llvm-project/pull/130275