[clang] [Clang] unrecognized html tag causing undesirable comment lexing (PR #152944)

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

Full details are available at: https://lab.llvm.org/buildbot/#/builders/141/builds/10886

<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/help/TestHelp.py (190 of 2297)
PASS: lldb-api :: commands/log/basic/TestLogHandlers.py (191 of 2297)
PASS: lldb-api :: commands/log/invalid-args/TestInvalidArgsLog.py (192 of 2297)
PASS: lldb-api :: commands/log/basic/TestLogging.py (193 of 2297)
PASS: lldb-api :: commands/memory/write/TestMemoryWrite.py (194 of 2297)
PASS: lldb-api :: commands/memory/read/TestMemoryRead.py (195 of 2297)
PASS: lldb-api :: commands/platform/basic/TestPlatformPython.py (196 of 2297)
PASS: lldb-api :: commands/platform/basic/TestPlatformCommand.py (197 of 2297)
PASS: lldb-api :: commands/platform/file/close/TestPlatformFileClose.py (198 of 2297)
PASS: lldb-api :: commands/platform/file/read/TestPlatformFileRead.py (199 of 2297)
FAIL: lldb-api :: commands/platform/launchgdbserver/TestPlatformLaunchGDBServer.py (200 of 2297)
******************** TEST 'lldb-api :: commands/platform/launchgdbserver/TestPlatformLaunchGDBServer.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 --cmake-build-type Release --skip-category=watchpoint C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\API\commands\platform\launchgdbserver -p TestPlatformLaunchGDBServer.py
--
Exit Code: 1

Command Output (stdout):
--
lldb version 22.0.0git (https://github.com/llvm/llvm-project.git revision 65ffa53cb70909be4dbedacd9de9de0725161592)
  clang revision 65ffa53cb70909be4dbedacd9de9de0725161592
  llvm revision 65ffa53cb70909be4dbedacd9de9de0725161592
Skipping the following test categories: ['watchpoint', 'libc++', 'libstdcxx', 'dwo', 'dsym', 'gmodules', 'debugserver', 'objc', 'fork', 'pexpect']


--
Command Output (stderr):
--
UNSUPPORTED: LLDB (C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe-aarch64) :: test_launch_error (TestPlatformLaunchGDBServer.TestPlatformProcessLaunchGDBServer.test_launch_error) (requires one of linux) 

lldb-server exiting...

FAIL: LLDB (C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe-aarch64) :: test_launch_with_unusual_process_name (TestPlatformLaunchGDBServer.TestPlatformProcessLaunchGDBServer.test_launch_with_unusual_process_name)

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

FAIL: test_launch_with_unusual_process_name (TestPlatformLaunchGDBServer.TestPlatformProcessLaunchGDBServer.test_launch_with_unusual_process_name)

   Test that lldb-server can launch a debug session when running under an

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

Traceback (most recent call last):

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\API\commands\platform\launchgdbserver\TestPlatformLaunchGDBServer.py", line 83, in test_launch_with_unusual_process_name

    self.expect("run", substrs=["exited with status = 0"])


```

</details>

https://github.com/llvm/llvm-project/pull/152944