[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 `clang-aarch64-sve-vls-2stage` running on `linaro-g3-03` while building `llvm` at step 12 "ninja check 2".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/4/builds/5495

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

```
Step 12 (ninja check 2) failure: stage 2 checked (failure)
******************** TEST 'LLVM-Unit :: Support/./SupportTests/48/88' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/unittests/Support/./SupportTests-LLVM-Unit-1372265-48-88.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=88 GTEST_SHARD_INDEX=48 /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/unittests/Support/./SupportTests
--

Script:
--
/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/unittests/Support/./SupportTests --gtest_filter=Caching.NoCommit
--
/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/unittests/Support/Caching.cpp:149: Failure
Value of: llvm::detail::TakeError(CFS->commit())
Expected: succeeded
  Actual: failed  (Failed to rename temporary file /tmp/lit-tmp-0egekfpk/llvm_test_cache/LLVMTest-742b3d.tmp.o to /tmp/lit-tmp-0egekfpk/llvm_test_cache/llvmcache-foo: No such file or directory
)


/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/unittests/Support/Caching.cpp:149
Value of: llvm::detail::TakeError(CFS->commit())
Expected: succeeded
  Actual: failed  (Failed to rename temporary file /tmp/lit-tmp-0egekfpk/llvm_test_cache/LLVMTest-742b3d.tmp.o to /tmp/lit-tmp-0egekfpk/llvm_test_cache/llvmcache-foo: No such file or directory
)



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


```

</details>

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