[llvm] [TableGen] Rework error reporting for duplicate Feature/Processor. (PR #102257)

[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/3603

Here is the relevant piece of the build log for the reference:
```
Step 6 (test) failure: build (failure)
...
PASS: lldb-api :: tools/lldb-server/TestNonStop.py (2632 of 2641)
PASS: lldb-api :: terminal/TestEditline.py (2633 of 2641)
PASS: lldb-api :: python_api/target/TestTargetAPI.py (2634 of 2641)
PASS: lldb-api :: python_api/global_module_cache/TestGlobalModuleCache.py (2635 of 2641)
PASS: lldb-api :: tools/lldb-server/TestGdbRemoteFork.py (2636 of 2641)
PASS: lldb-api :: tools/lldb-dap/attach/TestDAP_attach.py (2637 of 2641)
PASS: lldb-api :: commands/process/attach/TestProcessAttach.py (2638 of 2641)
PASS: lldb-api :: tools/lldb-server/TestLldbGdbServer.py (2639 of 2641)
PASS: lldb-api :: repl/clang/TestClangREPL.py (2640 of 2641)
TIMEOUT: lldb-api :: api/multiple-debuggers/TestMultipleDebuggers.py (2641 of 2641)
******************** TEST 'lldb-api :: api/multiple-debuggers/TestMultipleDebuggers.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/api/multiple-debuggers -p TestMultipleDebuggers.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 8ce5a32f0221b301e4a74c2263d9cbd240114ee0)
  clang revision 8ce5a32f0221b301e4a74c2263d9cbd240114ee0
  llvm revision 8ce5a32f0221b301e4a74c2263d9cbd240114ee0

--
Command Output (stderr):
--
Change dir to: /home/worker/2.0.1/lldb-x86_64-debian/llvm-project/lldb/test/API/api/multiple-debuggers
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/102257