[clang] Add tests for CWG issues 6, 212, 232, 2823. (PR #165633)

[LLVM Continuous Integration via cfe-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 `clang` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/162/builds/34258

<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/frame/var-dil/basics/MemberOf/TestFrameVarDILMemberOf.py (786 of 3263)
PASS: lldb-api :: functionalities/gdb_remote_client/TestPlatformKill.py (787 of 3263)
PASS: lldb-api :: commands/apropos/with-process/TestAproposWithProcess.py (788 of 3263)
PASS: lldb-api :: python_api/watchpoint/TestWatchpointIter.py (789 of 3263)
PASS: lldb-api :: commands/memory/write/TestMemoryWrite.py (790 of 3263)
XFAIL: lldb-api :: commands/process/launch-with-shellexpand/TestLaunchWithShellExpand.py (791 of 3263)
PASS: lldb-api :: commands/expression/result_numbering/TestResultNumbering.py (792 of 3263)
PASS: lldb-api :: lang/cpp/struct_with_keyword_name/TestStructWithKeywordName.py (793 of 3263)
PASS: lldb-api :: commands/frame/var-dil/basics/LocalVars/TestFrameVarDILLocalVars.py (794 of 3263)
PASS: lldb-api :: commands/frame/var-dil/basics/QualifiedId/TestFrameVarDILQualifiedId.py (795 of 3263)
FAIL: lldb-api :: tools/lldb-dap/invalidated-event/TestDAP_invalidatedEvent.py (796 of 3263)
******************** TEST 'lldb-api :: tools/lldb-dap/invalidated-event/TestDAP_invalidatedEvent.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 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 --make /usr/bin/gmake --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 --cmake-build-type Release -t /home/worker/2.0.1/lldb-x86_64-debian/llvm-project/lldb/test/API/tools/lldb-dap/invalidated-event -p TestDAP_invalidatedEvent.py
--
Exit Code: 1

Command Output (stdout):
--
lldb version 22.0.0git (https://github.com/llvm/llvm-project.git revision 1e3a1ce911d1e5e3804b63e3ba3059c36eb697e5)
  clang revision 1e3a1ce911d1e5e3804b63e3ba3059c36eb697e5
  llvm revision 1e3a1ce911d1e5e3804b63e3ba3059c36eb697e5
Skipping the following test categories: ['libc++', 'msvcstl', 'dsym', 'gmodules', 'debugserver', 'objc']

--
Command Output (stderr):
--
Change dir to: /home/worker/2.0.1/lldb-x86_64-debian/llvm-project/lldb/test/API/tools/lldb-dap/invalidated-event
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: 


```

</details>

https://github.com/llvm/llvm-project/pull/165633