[llvm] LowerAtomic: Use explicit alignment in lowerAtomicCmpXchgInst (PR #103767)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-x86_64-debian` running on `lldb-x86_64-debian` while building `llvm` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/162/builds/4040

Here is the relevant piece of the build log for the reference:
```
Step 6 (test) failure: build (failure)
...
UNSUPPORTED: lldb-shell :: ScriptInterpreter/Python/Crashlog/altered_threadState.test (2636 of 2645)
UNSUPPORTED: lldb-shell :: ScriptInterpreter/Lua/lua.test (2637 of 2645)
UNSUPPORTED: lldb-shell :: SymbolFile/PDB/function-level-linking.test (2638 of 2645)
UNSUPPORTED: lldb-shell :: ScriptInterpreter/Python/Crashlog/last_exception_backtrace_crashlog.test (2639 of 2645)
PASS: lldb-api :: api/multithreaded/TestMultithreaded.py (2640 of 2645)
PASS: lldb-api :: tools/lldb-server/TestGdbRemoteFork.py (2641 of 2645)
PASS: lldb-api :: tools/lldb-server/TestLldbGdbServer.py (2642 of 2645)
PASS: lldb-api :: commands/process/attach/TestProcessAttach.py (2643 of 2645)
PASS: lldb-api :: repl/clang/TestClangREPL.py (2644 of 2645)
TIMEOUT: lldb-api :: functionalities/single-thread-step/TestSingleThreadStepTimeout.py (2645 of 2645)
******************** TEST 'lldb-api :: functionalities/single-thread-step/TestSingleThreadStepTimeout.py' FAILED ********************
Script:
--
/usr/bin/python3 /home/worker/2.0.1/lldb-x86_64-debian/llvm-project/lldb/test/API/dotest.py -u CXXFLAGS -u CFLAGS --env ARCHIVER=/usr/bin/ar --env OBJCOPY=/usr/bin/objcopy --env LLVM_LIBS_DIR=/home/worker/2.0.1/lldb-x86_64-debian/build/./lib --env LLVM_INCLUDE_DIR=/home/worker/2.0.1/lldb-x86_64-debian/build/include --env LLVM_TOOLS_DIR=/home/worker/2.0.1/lldb-x86_64-debian/build/./bin --arch x86_64 --build-dir /home/worker/2.0.1/lldb-x86_64-debian/build/lldb-test-build.noindex --lldb-module-cache-dir /home/worker/2.0.1/lldb-x86_64-debian/build/lldb-test-build.noindex/module-cache-lldb/lldb-api --clang-module-cache-dir /home/worker/2.0.1/lldb-x86_64-debian/build/lldb-test-build.noindex/module-cache-clang/lldb-api --executable /home/worker/2.0.1/lldb-x86_64-debian/build/./bin/lldb --compiler /home/worker/2.0.1/lldb-x86_64-debian/build/./bin/clang --dsymutil /home/worker/2.0.1/lldb-x86_64-debian/build/./bin/dsymutil --llvm-tools-dir /home/worker/2.0.1/lldb-x86_64-debian/build/./bin --lldb-obj-root /home/worker/2.0.1/lldb-x86_64-debian/build/tools/lldb --lldb-libs-dir /home/worker/2.0.1/lldb-x86_64-debian/build/./lib -t /home/worker/2.0.1/lldb-x86_64-debian/llvm-project/lldb/test/API/functionalities/single-thread-step -p TestSingleThreadStepTimeout.py
--
Exit Code: -9
Timeout: Reached timeout of 600 seconds

Command Output (stdout):
--
lldb version 20.0.0git (https://github.com/llvm/llvm-project.git revision 5ececb4745a37f7b3dfade12e44e95c6b5e3c5bf)
  clang revision 5ececb4745a37f7b3dfade12e44e95c6b5e3c5bf
  llvm revision 5ececb4745a37f7b3dfade12e44e95c6b5e3c5bf

--
Command Output (stderr):
--
Change dir to: /home/worker/2.0.1/lldb-x86_64-debian/llvm-project/lldb/test/API/functionalities/single-thread-step
runCmd: settings clear -all

output: 

runCmd: settings set symbols.enable-external-lookup false

output: 

runCmd: settings set target.inherit-tcc true

output: 

runCmd: settings set target.disable-aslr false

output: 

runCmd: settings set target.detach-on-error false

output: 

runCmd: settings set target.auto-apply-fixits false

```

https://github.com/llvm/llvm-project/pull/103767