[clang] [clang-format] Add ObjCSpaceBeforeMethodDeclColon option to control space before Objective-C method return type (PR #170579)

[via cfe-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Linux-->
# :penguin: Linux x64 Test Results

* 85912 tests passed
* 1218 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### Clang
<details>
<summary>Clang.Format/docs_updated.test</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
"/usr/bin/python3" /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Format/../../docs/tools/dump_format_style.py -o /home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Format/Output/docs_updated.test.tmp.style
# executed command: /usr/bin/python3 /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Format/../../docs/tools/dump_format_style.py -o /home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Format/Output/docs_updated.test.tmp.style
# note: command had no output on stdout or stderr
# RUN: at line 2
diff --strip-trailing-cr /home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Format/Output/docs_updated.test.tmp.style    /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Format/../../docs/ClangFormatStyleOptions.rst
# executed command: diff --strip-trailing-cr /home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Format/Output/docs_updated.test.tmp.style /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Format/../../docs/ClangFormatStyleOptions.rst
# .---command stdout------------
# | *** /home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Format/Output/docs_updated.test.tmp.style
# | --- /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Format/../../docs/ClangFormatStyleOptions.rst
# | ***************
# | *** 5534,5540 ****
# |   
# |   .. _ObjCSpaceAfterMethodDeclarationPrefix:
# |   
# | ! **ObjCSpaceAfterMethodDeclarationPrefix** (``Boolean``) :versionbadge:`clang-format 23` :ref:`¶ <ObjCSpaceAfterMethodDeclarationPrefix>`
# |     Add or remove a space between the '-'/'+' and the return type in
# |     Objective-C method declarations. i.e
# |   
# | --- 5534,5540 ----
# |   
# |   .. _ObjCSpaceAfterMethodDeclarationPrefix:
# |   
# | ! **ObjCSpaceAfterMethodDeclarationPrefix** (``Boolean``) :versionbadge:`clang-format 22` :ref:`¶ <ObjCSpaceAfterMethodDeclarationPrefix>`
# |     Add or remove a space between the '-'/'+' and the return type in
# |     Objective-C method declarations. i.e
# |   
# `-----------------------------
# error: command failed with exit status: 1

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/170579