git: 294ba5698039..3e481a3afe13 - vendor/llvm-project/release-21.x - vendor branch updated

From: Dimitry Andric <dim_at_FreeBSD.org>
Date: Sat, 10 Jan 2026 11:22:23 UTC
The branch vendor/llvm-project/release-21.x has been updated by dim:

URL: https://cgit.FreeBSD.org/src/log/?id=294ba5698039..3e481a3afe13

3e481a3afe13 Vendor import of llvm-project branch release/21.x llvmorg-21.1.8-0-g2078da43e25a, a.k.a. 21.1.8 release.