[llvm] [X86] Add test coverage for the concatable sources vpermv3 -> vpermv fold for non-constant shuffle masks (PR #133415)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-arm-ubuntu` running on `linaro-lldb-arm-ubuntu` while building `llvm` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/18/builds/13649

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

```
Step 6 (test) failure: build (failure)
...
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/coroutine_handle/TestCoroutineHandle.py (363 of 2932)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/deque/TestDataFormatterGenericDeque.py (364 of 2932)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/bitset/TestDataFormatterGenericBitset.py (365 of 2932)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/list/loop/TestDataFormatterGenericListLoop.py (366 of 2932)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/list/TestDataFormatterGenericList.py (367 of 2932)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/multimap/TestDataFormatterGenericMultiMap.py (368 of 2932)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/forward_list/TestDataFormatterGenericForwardList.py (369 of 2932)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/optional/TestDataFormatterGenericOptional.py (370 of 2932)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/multiset/TestDataFormatterGenericMultiSet.py (371 of 2932)
UNRESOLVED: lldb-api :: commands/gui/spawn-threads/TestGuiSpawnThreads.py (372 of 2932)
******************** TEST 'lldb-api :: commands/gui/spawn-threads/TestGuiSpawnThreads.py' FAILED ********************
Script:
--
/usr/bin/python3.10 /home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/test/API/dotest.py -u CXXFLAGS -u CFLAGS --env LLVM_LIBS_DIR=/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./lib --env LLVM_INCLUDE_DIR=/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/include --env LLVM_TOOLS_DIR=/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin --arch armv8l --build-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex --lldb-module-cache-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex/module-cache-lldb/lldb-api --clang-module-cache-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex/module-cache-clang/lldb-api --executable /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin/lldb --compiler /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin/clang --dsymutil /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin/dsymutil --make /usr/bin/gmake --llvm-tools-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin --lldb-obj-root /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/tools/lldb --lldb-libs-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./lib /home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/test/API/commands/gui/spawn-threads -p TestGuiSpawnThreads.py
--
Exit Code: 1

Command Output (stdout):
--
lldb version 21.0.0git (https://github.com/llvm/llvm-project.git revision 45c3fe8ff339843cdf0cfc8ccae91c0a4b7c09cd)
  clang revision 45c3fe8ff339843cdf0cfc8ccae91c0a4b7c09cd
  llvm revision 45c3fe8ff339843cdf0cfc8ccae91c0a4b7c09cd
Skipping the following test categories: ['libc++', 'dsym', 'gmodules', 'debugserver', 'objc']

--
Command Output (stderr):
--
FAIL: LLDB (/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/bin/clang-arm) :: test_gui (TestGuiSpawnThreads.TestGuiSpawnThreadsTest)
======================================================================
ERROR: test_gui (TestGuiSpawnThreads.TestGuiSpawnThreadsTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/packages/Python/lldbsuite/test/decorators.py", line 148, in wrapper
    return func(*args, **kwargs)
  File "/home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/test/API/commands/gui/spawn-threads/TestGuiSpawnThreads.py", line 44, in test_gui
    self.child.expect_exact(f"thread #{i + 2}: tid =")
  File "/usr/local/lib/python3.10/dist-packages/pexpect/spawnbase.py", line 432, in expect_exact
    return exp.expect_loop(timeout)
  File "/usr/local/lib/python3.10/dist-packages/pexpect/expect.py", line 181, in expect_loop
    return self.timeout(e)
  File "/usr/local/lib/python3.10/dist-packages/pexpect/expect.py", line 144, in timeout
    raise exc
pexpect.exceptions.TIMEOUT: Timeout exceeded.
<pexpect.pty_spawn.spawn object at 0xea29a4f0>
command: /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/bin/lldb
args: ['/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/bin/lldb', '--no-lldbinit', '--no-use-colors', '-O', 'settings clear -all', '-O', 'settings set symbols.enable-external-lookup false', '-O', 'settings set target.inherit-tcc true', '-O', 'settings set target.disable-aslr false', '-O', 'settings set target.detach-on-error false', '-O', 'settings set target.auto-apply-fixits false', '-O', 'settings set plugin.process.gdb-remote.packet-timeout 60', '-O', 'settings set symbols.clang-modules-cache-path "/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex/module-cache-lldb/lldb-api"', '-O', 'settings set use-color false', '-O', 'settings set show-statusline false', '--file', '/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex/commands/gui/spawn-threads/TestGuiSpawnThreads.test_gui/a.out']
buffer (last 100 chars): b'0000000a82ee8\x1b[H'
before (last 100 chars): b'ofbit = _S_eofbit\x1b[100;21Hstopped\x1b[100;41HThread: 3976461     Frame:   0  PC = 0x0000000000a82ee8\x1b[H'
after: <class 'pexpect.exceptions.TIMEOUT'>

```

</details>

https://github.com/llvm/llvm-project/pull/133415