git: 2d835ae86572..4fdf604ba667 - vendor/llvm-project/release-18.x - vendor branch updated

[Dimitry Andric]

The branch vendor/llvm-project/release-18.x has been updated by dim:

URL: https://cgit.FreeBSD.org/src/log/?id=2d835ae86572..4fdf604ba667

4fdf604ba667 Vendor import of llvm-project branch release/18.x 
llvmorg-18.1.0-rc2-0-gc6c86965d967.