[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 `lld-x86_64-ubuntu-fast` running on `as-builder-4` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/33/builds/12660

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

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM-Unit :: Support/./SupportTests/48/88' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/build/unittests/Support/./SupportTests-LLVM-Unit-1932613-48-88.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=88 GTEST_SHARD_INDEX=48 /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/build/unittests/Support/./SupportTests
--

Note: This is test shard 49 of 88.
[==========] Running 16 tests from 16 test suites.
[----------] Global test environment set-up.
[----------] 1 test from CPUAlignBuildAttr
[ RUN      ] CPUAlignBuildAttr.testBuildAttr
[       OK ] CPUAlignBuildAttr.testBuildAttr (0 ms)
[----------] 1 test from CPUAlignBuildAttr (0 ms total)

[----------] 1 test from Caching
[ RUN      ] Caching.NoCommit
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/unittests/Support/Caching.cpp:145: Failure
Value of: bool(FileOrErr)
  Actual: false
Expected: true

Expected<T> must be checked before access or destruction.
Unchecked Expected<T> contained error:
No such file or directory: LLVMTestCache: Can't get a temporary fileStack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  SupportTests 0x00005597b4336050
1  SupportTests 0x00005597b433349f
2  SupportTests 0x00005597b43335ea
3  libc.so.6    0x00007f64f003d520
4  libc.so.6    0x00007f64f00919fc pthread_kill + 300
5  libc.so.6    0x00007f64f003d476 raise + 22
6  libc.so.6    0x00007f64f00237f3 abort + 211
7  SupportTests 0x00005597b3dd2c1e
8  SupportTests 0x00005597b3dd6740
9  SupportTests 0x00005597b4357633
10 SupportTests 0x00005597b4362472
11 SupportTests 0x00005597b4362a11
12 SupportTests 0x00005597b436e24a
13 SupportTests 0x00005597b435672f
14 SupportTests 0x00005597b3d3a2ca
15 libc.so.6    0x00007f64f0024d90
16 libc.so.6    0x00007f64f0024e40 __libc_start_main + 128
17 SupportTests 0x00005597b3d3a925

--
exit: -6
--
shard JSON output does not exist: /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/build/unittests/Support/./SupportTests-LLVM-Unit-1932613-48-88.json
********************


```

</details>

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