[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 `ppc64le-flang-rhel-clang` running on `ppc64le-flang-rhel-test` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/157/builds/20822

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
3.975 [4784/44/1904] Linking CXX static library lib/libMLIRDerivedAttributeOpInterface.a
3.975 [4784/43/1905] Linking CXX static library lib/libMLIRBytecodeOpInterface.a
3.976 [4783/43/1906] Building InstallNameToolOpts.inc...
3.978 [4782/43/1907] Building OtoolOpts.inc...
3.978 [4782/42/1908] Building WindresOpts.inc...
3.978 [4782/41/1909] Linking CXX static library lib/libMLIRObservers.a
3.979 [4781/41/1910] Linking CXX static library lib/libMLIRCopyOpInterface.a
3.987 [4781/40/1911] Building BitcodeStripOpts.inc...
3.989 [4780/40/1912] Building ROCDLOpsAttributes.cpp.inc...
3.989 [4780/39/1913] Building CXX object lib/WindowsManifest/CMakeFiles/LLVMWindowsManifest.dir/WindowsManifestMerger.cpp.o
FAILED: lib/WindowsManifest/CMakeFiles/LLVMWindowsManifest.dir/WindowsManifestMerger.cpp.o 
ccache /home/buildbots/llvm-external-buildbots/clang.19.1.7/bin/clang++ -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/lib/WindowsManifest -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/lib/WindowsManifest -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT lib/WindowsManifest/CMakeFiles/LLVMWindowsManifest.dir/WindowsManifestMerger.cpp.o -MF lib/WindowsManifest/CMakeFiles/LLVMWindowsManifest.dir/WindowsManifestMerger.cpp.o.d -o lib/WindowsManifest/CMakeFiles/LLVMWindowsManifest.dir/WindowsManifestMerger.cpp.o -c /home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/lib/WindowsManifest/WindowsManifestMerger.cpp
/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/lib/WindowsManifest/WindowsManifestMerger.cpp:679:51: error: definition of implicitly declared destructor
  679 | WindowsManifestMerger::WindowsManifestMergerImpl::~WindowsManifestMergerImpl() {
      |                                                   ^
1 error generated.
3.990 [4780/38/1914] Linking CXX static library lib/libMLIRBytecodeReader.a
3.990 [4780/37/1915] Linking CXX static library lib/libMLIRFunctionInterfaces.a
3.991 [4780/36/1916] Building ROCDLOpsDialect.h.inc...
3.992 [4780/35/1917] Linking CXX static library lib/libMLIRInferIntRangeCommon.a
3.993 [4780/34/1918] Building ROCDLOpsDialect.cpp.inc...
3.994 [4780/33/1919] Building CXX object tools/llvm-mt/CMakeFiles/llvm-mt.dir/llvm-mt-driver.cpp.o
3.994 [4780/32/1920] Linking CXX static library lib/libMLIRCAPIInterfaces.a
3.994 [4780/31/1921] Building ROCDLConversions.inc...
3.994 [4780/30/1922] Linking CXX static library lib/libMLIRTilingInterface.a
3.995 [4780/29/1923] Building ROCDLOpsTypes.cpp.inc...
3.995 [4780/28/1924] Building ROCDLOpsAttributes.h.inc...
3.995 [4780/27/1925] Building CXX object tools/llvm-mt/CMakeFiles/llvm-mt.dir/llvm-mt.cpp.o
3.998 [4780/26/1926] Building ROCDLOpsTypes.h.inc...
3.998 [4780/25/1927] Linking CXX static library lib/libMLIRDebug.a
3.999 [4780/24/1928] Linking CXX static library lib/libMLIRBytecodeWriter.a
4.000 [4780/23/1929] Building StripOpts.inc...
4.005 [4780/22/1930] Building NVVMOps.cpp.inc...
4.014 [4780/21/1931] Generating VCSVersion.inc
4.030 [4780/20/1932] Building NVVMOps.h.inc...
4.038 [4780/19/1933] Building TestOps.cpp.inc...
4.041 [4780/18/1934] Building TestOps.h.inc...
4.049 [4780/17/1935] Building ROCDLOps.cpp.inc...
4.052 [4780/16/1936] Building ROCDLOps.h.inc...
4.114 [4780/15/1937] Building Options.inc...
4.757 [4780/14/1938] Building PPCGenAsmMatcher.inc...
4.803 [4780/13/1939] Building PPCGenRegisterBank.inc...
4.803 [4780/12/1940] Building PPCGenMCCodeEmitter.inc...
4.843 [4780/11/1941] Building PPCGenExegesis.inc...
4.865 [4780/10/1942] Building PPCGenAsmWriter.inc...
4.866 [4780/9/1943] Building PPCGenDisassemblerTables.inc...
4.930 [4780/8/1944] Building PPCGenRegisterInfo.inc...
4.934 [4780/7/1945] Building PPCGenCallingConv.inc...
5.289 [4780/6/1946] Building PPCGenSubtargetInfo.inc...

```

</details>

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