clang-format `RemoveParentheses: ReturnStatement` on `decltype(auto)` return type

[owenca]

clang-format (versions 17.0.1 and main) should not remove the outermost parentheses of return statement expressions when the function return type is decltype(auto).

[llvmbot]

@llvm/issue-subscribers-clang-format

Details

clang-format (versions 17.0.1 and main) should _not_ remove the outermost parentheses of `return` statement expressions when the function return type is `decltype(auto)`.

[owenca]

/cherry-pick c83d64f