[clang] [CIR] Support PackIndexingExpr for LValue and Aggregates (PR #227040)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-aarch64-ubuntu` running on `linaro-lldb-aarch64-ubuntu` while building `clang` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/59/builds/38092

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

```
Step 6 (test) failure: build (failure)
...
PASS: lldb-api :: commands/target/create-no-such-arch/TestNoSuchArch.py (272 of 2690)
PASS: lldb-api :: commands/target/modules/search-paths/insert/TestTargetModulesSearchpathsInsert.py (273 of 2690)
PASS: lldb-api :: commands/target/select/TestTargetSelect.py (274 of 2690)
PASS: lldb-api :: commands/target/module-hook/enable/TestTargetModuleHookEnable.py (275 of 2690)
PASS: lldb-api :: commands/target/modules/lookup/TestImageLookupPCExpression.py (276 of 2690)
SKIPPED: lldb-api :: commands/trace/TestTraceDumpFunctionCalls.py (277 of 2690)
SKIPPED: lldb-api :: commands/trace/TestTraceDumpInfo.py (278 of 2690)
SKIPPED: lldb-api :: commands/trace/TestTraceDumpInstructions.py (279 of 2690)
SKIPPED: lldb-api :: commands/trace/TestTraceEvents.py (280 of 2690)
UNRESOLVED: lldb-api :: api/multithreaded/TestMultithreaded.py (281 of 2690)
******************** TEST 'lldb-api :: api/multithreaded/TestMultithreaded.py' FAILED ********************
Script:
--
/usr/bin/python3.10 /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/dotest.py -u CXXFLAGS -u CFLAGS --env LLVM_LIBS_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./lib --env LLVM_INCLUDE_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/include --env LLVM_TOOLS_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin --triple aarch64-unknown-linux-gnu --build-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build --lldb-module-cache-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build/module-cache-lldb/lldb-api --clang-module-cache-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build/module-cache-clang/lldb-api --executable /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/lldb --lldb-python-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/local/lib/python3.10/dist-packages --compiler /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/clang --dsymutil /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/dsymutil --make /usr/bin/gmake --llvm-tools-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin --lldb-obj-root /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/tools/lldb --lldb-libs-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./lib --cmake-build-type Release /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/api/multithreaded -p TestMultithreaded.py --timeout 600
--
Exit Code: 1

Command Output (stdout):
--
Adding command some-cmd and report-cmd
some output
(lldb) thread step-inst
check_state: running  OK
check_state: stopped  OK
Skipping the following test categories: libc++, msvcstl, dsym, pdb, gmodules, debugserver, objc

--
Command Output (stderr):
--
PASS: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_breakpoint_callback (TestMultithreaded.SBBreakpointCallbackCase)
PASS: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_breakpoint_location_callback (TestMultithreaded.SBBreakpointCallbackCase)
PASS: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_concurrent_unwind (TestMultithreaded.SBBreakpointCallbackCase)
FAIL: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_python_stop_hook (TestMultithreaded.SBBreakpointCallbackCase)
Log Files:
 - /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build/api/multithreaded/TestMultithreaded.test_python_stop_hook/Error_test_python_stop_hook.log
PASS: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_sb_api_listener_event_description (TestMultithreaded.SBBreakpointCallbackCase)
PASS: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_sb_api_listener_event_process_state (TestMultithreaded.SBBreakpointCallbackCase)
SKIPPED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_sb_api_listener_resume (TestMultithreaded.SBBreakpointCallbackCase) (skipping due to the following parameter(s): target o/s) 
Log Files:
 - /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build/api/multithreaded/TestMultithreaded.test_sb_api_listener_resume/SkippedTest_test_sb_api_listener_resume.log
======================================================================
ERROR: test_python_stop_hook (TestMultithreaded.SBBreakpointCallbackCase)
   Test that you can run a python command in a stop-hook when stdin is File based.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/packages/Python/lldbsuite/test/decorators.py", line 221, in wrapper
    return func(*args, **kwargs)
  File "/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/api/multithreaded/TestMultithreaded.py", line 25, in test_python_stop_hook
    self.build_and_test("driver.cpp test_stop-hook.cpp", "test_python_stop_hook")

```

</details>

https://github.com/llvm/llvm-project/pull/227040