[llvm] [CMake] Handle clang in MSVC mode in GetHostTriple (PR #116701)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-aarch64-windows` running on `linaro-armv8-windows-msvc-05` while building `llvm` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/141/builds/4260

<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/platform/file/close/TestPlatformFileClose.py (177 of 2049)
PASS: lldb-api :: commands/platform/file/read/TestPlatformFileRead.py (178 of 2049)
XFAIL: lldb-api :: commands/platform/connect/TestPlatformConnect.py (179 of 2049)
UNSUPPORTED: lldb-api :: commands/platform/launchgdbserver/TestPlatformLaunchGDBServer.py (180 of 2049)
UNSUPPORTED: lldb-api :: commands/platform/process/list/TestProcessList.py (181 of 2049)
UNSUPPORTED: lldb-api :: commands/platform/sdk/TestPlatformSDK.py (182 of 2049)
UNSUPPORTED: lldb-api :: commands/process/attach-resume/TestAttachResume.py (183 of 2049)
PASS: lldb-api :: commands/platform/process/launch/TestPlatformProcessLaunch.py (184 of 2049)
UNSUPPORTED: lldb-api :: commands/process/attach/attach_denied/TestAttachDenied.py (185 of 2049)
PASS: lldb-api :: commands/process/continue_to_bkpt/TestContinueToBkpts.py (186 of 2049)
FAIL: lldb-api :: commands/process/detach-resumes/TestDetachResumes.py (187 of 2049)
******************** TEST 'lldb-api :: commands/process/detach-resumes/TestDetachResumes.py' FAILED ********************
Script:
--
C:/Users/tcwg/scoop/apps/python/current/python.exe C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/llvm-project/lldb\test\API\dotest.py -u CXXFLAGS -u CFLAGS --env LLVM_LIBS_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./lib --env LLVM_INCLUDE_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/include --env LLVM_TOOLS_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin --arch aarch64 --build-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex --lldb-module-cache-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex/module-cache-lldb\lldb-api --clang-module-cache-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex/module-cache-clang\lldb-api --executable C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/lldb.exe --compiler C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/clang.exe --dsymutil C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/dsymutil.exe --make C:/Users/tcwg/scoop/shims/make.exe --llvm-tools-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin --lldb-obj-root C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/tools/lldb --lldb-libs-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./lib --skip-category=watchpoint C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\API\commands\process\detach-resumes -p TestDetachResumes.py
--
Exit Code: 1

Command Output (stdout):
--
lldb version 20.0.0git (https://github.com/llvm/llvm-project.git revision e9be21786c972de93206599d4e06b79c2ca8f772)
  clang revision e9be21786c972de93206599d4e06b79c2ca8f772
  llvm revision e9be21786c972de93206599d4e06b79c2ca8f772
Skipping the following test categories: ['watchpoint', 'libc++', 'libstdcxx', 'dwo', 'dsym', 'gmodules', 'debugserver', 'objc', 'fork', 'pexpect']


--
Command Output (stderr):
--
ls: cannot access 'C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\lldb-test-build.noindex\commands\process\detach-resumes\TestDetachResumes.test_detach_resumes\exit_file_1732876764': No such file or directory
ls: cannot access 'C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\lldb-test-build.noindex\commands\process\detach-resumes\TestDetachResumes.test_detach_resumes\exit_file_1732876764': No such file or directory
ls: cannot access 'C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\lldb-test-build.noindex\commands\process\detach-resumes\TestDetachResumes.test_detach_resumes\exit_file_1732876764': No such file or directory
ls: cannot access 'C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\lldb-test-build.noindex\commands\process\detach-resumes\TestDetachResumes.test_detach_resumes\exit_file_1732876764': No such file or directory
ls: cannot access 'C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\lldb-test-build.noindex\commands\process\detach-resumes\TestDetachResumes.test_detach_resumes\exit_file_1732876764': No such file or directory
ls: cannot access 'C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\lldb-test-build.noindex\commands\process\detach-resumes\TestDetachResumes.test_detach_resumes\exit_file_1732876764': No such file or directory
FAIL: LLDB (C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe-aarch64) :: test_detach_resumes (TestDetachResumes.DetachResumesTestCase.test_detach_resumes)

======================================================================

FAIL: test_detach_resumes (TestDetachResumes.DetachResumesTestCase.test_detach_resumes)

----------------------------------------------------------------------

Traceback (most recent call last):

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\API\commands\process\detach-resumes\TestDetachResumes.py", line 59, in test_detach_resumes

    lldbutil.wait_for_file_on_target(self, exit_file_path)


```

</details>

https://github.com/llvm/llvm-project/pull/116701