git: 4fdf604ba667..e15a4f0a320e - vendor/llvm-project/release-18.x - vendor branch updated

From: Dimitry Andric <dim_at_FreeBSD.org>
Date: Tue, 20 Feb 2024 18:47:26 UTC
The branch vendor/llvm-project/release-18.x has been updated by dim:

URL: https://cgit.FreeBSD.org/src/log/?id=4fdf604ba667..e15a4f0a320e

e15a4f0a320e Vendor import of llvm-project branch release/18.x llvmorg-18.1.0-rc2-53-gc7b0a6ecd442.