git: 9a7cb8417a2a..c6bcacc7c9d8 - vendor/llvm-project/release-18.x - vendor branch updated

From: Dimitry Andric <dim_at_FreeBSD.org>
Date: Thu, 23 May 2024 20:22:12 UTC
The branch vendor/llvm-project/release-18.x has been updated by dim:

URL: https://cgit.FreeBSD.org/src/log/?id=9a7cb8417a2a..c6bcacc7c9d8

c6bcacc7c9d8 Vendor import of llvm-project branch release/18.x llvmorg-18.1.6-0-g1118c2e05e67.