[clang-tools-extra] Add flag to specify an alternative to std::move (PR #138757)

[Congcong Cai via cfe-commits]

HerrCai0907 wrote:

> Since :: are specified before std::move, I am not entirely sure whether it would be required for the custom function. In my testing it worked both with and without ::.

with :: means is a full name including namespace, without :: means only match function name.

https://github.com/llvm/llvm-project/pull/138757