[clang] [llvm] [clang-format] Add CI check confirming ClangFormatStyleOptions.rst is up-to-date. (PR #111513)

[Owen Pan via cfe-commits]

================
@@ -53,3 +53,10 @@ foreach (file IN LISTS files)
 endforeach ()
 
 add_custom_target(clang-format-check-format DEPENDS ${check_format_depends})
+
+add_custom_target(clang-format-style-options
+    COMMAND "${Python3_EXECUTABLE}" dump_format_style.py
+    WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/../../docs/tools"
+    DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/../../include/clang/Format/Format.h"
+            "${CMAKE_CURRENT_SOURCE_DIR}/../../include/clang/Tooling/Inclusions/IncludeStyle.h")
----------------
owenca wrote:

Seems this would fix https://github.com/llvm/llvm-project/pull/111513/files#r1815884464:
```suggestion
set(style_options_depends ${CLANG_SOURCE_DIR}/docs/ClangFormatStyleOptions.rst)
add_custom_command(OUTPUT ${style_options_depends}
  COMMAND ${Python3_EXECUTABLE} dump_format_style.py
  WORKING_DIRECTORY ${CLANG_SOURCE_DIR}/docs/tools
  DEPENDS ${CLANG_SOURCE_DIR}/include/clang/Format/Format.h
          ${CLANG_SOURCE_DIR}/include/clang/Tooling/Inclusions/IncludeStyle.h
  )
add_custom_target(clang-format-style-options DEPENDS ${style_options_depends})
```

https://github.com/llvm/llvm-project/pull/111513