[llvm] [llvm-mt] Use XmlDeleter to free xmlFreeDoc (PR #128472)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-win-fast` running on `as-builder-3` while building `llvm` at step 6 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/2/builds/17774

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

```
Step 6 (build-unified-tree) failure: build (failure)
...
[353/4123] Linking CXX executable bin\split-file.exe
[354/4123] Linking CXX executable bin\yaml-bench.exe
[355/4123] Building ACC.h.inc...
[356/4123] Building ACC.inc...
[357/4123] Building OMP.h.inc...
[358/4123] Building CXX object utils\not\CMakeFiles\not.dir\not.cpp.obj
[359/4123] Building OMP.inc...
[360/4123] Building CXX object tools\reduce-chunk-list\CMakeFiles\reduce-chunk-list.dir\reduce-chunk-list.cpp.obj
[361/4123] Building CXX object tools\llvm-undname\CMakeFiles\llvm-undname.dir\llvm-undname.cpp.obj
[362/4123] Building CXX object lib\WindowsManifest\CMakeFiles\LLVMWindowsManifest.dir\WindowsManifestMerger.cpp.obj
FAILED: lib/WindowsManifest/CMakeFiles/LLVMWindowsManifest.dir/WindowsManifestMerger.cpp.obj 
C:\ninja\ccache.exe C:\PROGRA~1\MICROS~2\2022\COMMUN~1\VC\Tools\MSVC\1438~1.331\bin\Hostx64\x64\cl.exe  /nologo /TP -DGTEST_HAS_RTTI=0 -DUNICODE -D_CRT_NONSTDC_NO_DEPRECATE -D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS -D_HAS_EXCEPTIONS=0 -D_SCL_SECURE_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS -D_UNICODE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -IC:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\build\lib\WindowsManifest -IC:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\llvm-project\llvm\lib\WindowsManifest -IC:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\build\include -IC:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\llvm-project\llvm\include /DWIN32 /D_WINDOWS   /Zc:inline /Zc:preprocessor /Zc:__cplusplus /Oi /bigobj /permissive- /W4 -wd4141 -wd4146 -wd4244 -wd4267 -wd4291 -wd4351 -wd4456 -wd4457 -wd4458 -wd4459 -wd4503 -wd4624 -wd4722 -wd4100 -wd4127 -wd4512 -wd4505 -wd4610 -wd4510 -wd4702 -wd4245 -wd4706 -wd4310 -wd4701 -wd4703 -wd4389 -wd4611 -wd4805 -wd4204 -wd4577 -wd4091 -wd4592 -wd4319 -wd4709 -wd5105 -wd4324 -wd4251 -wd4275 -w14062 -we4238 /Gw /O2 /Ob2 /DNDEBUG -MD  /EHs-c- /GR- -std:c++17 /showIncludes /Folib\WindowsManifest\CMakeFiles\LLVMWindowsManifest.dir\WindowsManifestMerger.cpp.obj /Fdlib\WindowsManifest\CMakeFiles\LLVMWindowsManifest.dir\LLVMWindowsManifest.pdb /FS -c C:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\llvm-project\llvm\lib\WindowsManifest\WindowsManifestMerger.cpp
C:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\llvm-project\llvm\lib\WindowsManifest\WindowsManifestMerger.cpp(679): error C2600: 'llvm::windows_manifest::WindowsManifestMerger::WindowsManifestMergerImpl::~WindowsManifestMergerImpl': cannot define a compiler-generated special member function (must be declared in the class first)
[363/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\check.cc.obj
[364/4123] Building CXX object utils\KillTheDoctor\CMakeFiles\KillTheDoctor.dir\KillTheDoctor.cpp.obj
[365/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\colorprint.cc.obj
[366/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\statistics.cc.obj
[367/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\complexity.cc.obj
[368/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\benchmark.cc.obj
[369/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\sysinfo.cc.obj
[370/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\benchmark_api_internal.cc.obj
[371/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\perf_counters.cc.obj
[372/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\reporter.cc.obj
[373/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\console_reporter.cc.obj
[374/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\timers.cc.obj
[375/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\csv_reporter.cc.obj
[376/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\benchmark_runner.cc.obj
[377/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\json_reporter.cc.obj
[378/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\string_util.cc.obj
[379/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\commandlineflags.cc.obj
[380/4123] Building CXX object lib\CodeGenTypes\CMakeFiles\LLVMCodeGenTypes.dir\LowLevelType.cpp.obj
[381/4123] Building CXX object lib\Frontend\OpenACC\CMakeFiles\LLVMFrontendOpenACC.dir\ACC.cpp.obj
[382/4123] Building CXX object third-party\benchmark\src\CMakeFiles\benchmark.dir\benchmark_register.cc.obj
[383/4123] Linking CXX executable bin\llvm-undname.exe
[384/4123] Building IntrinsicsAArch64.h...
[385/4123] Linking CXX executable bin\not.exe
[386/4123] Linking CXX executable bin\reduce-chunk-list.exe
[387/4123] Building IntrinsicsAMDGPU.h...
[388/4123] Linking CXX executable bin\clang-tblgen.exe
[389/4123] Building IntrinsicEnums.inc...
[390/4123] Building IntrinsicsDirectX.h...
[391/4123] Building IntrinsicsARM.h...
[392/4123] Building IntrinsicsBPF.h...
[393/4123] Building IntrinsicsHexagon.h...
[394/4123] Building IntrinsicsNVPTX.h...
[395/4123] Building IntrinsicsPowerPC.h...
[396/4123] Building IntrinsicImpl.inc...
[397/4123] Building IntrinsicsX86.h...
[398/4123] Building IntrinsicsSPIRV.h...

```

</details>

https://github.com/llvm/llvm-project/pull/128472