git: e15a4f0a320e..b3ca86c61e06 - vendor/llvm-project/release-18.x - vendor branch updated

From: Dimitry Andric <dim_at_FreeBSD.org>
Date: Wed, 21 Feb 2024 09:59:40 UTC
The branch vendor/llvm-project/release-18.x has been updated by dim:

URL: https://cgit.FreeBSD.org/src/log/?id=e15a4f0a320e..b3ca86c61e06

b3ca86c61e06 Vendor import of llvm-project branch release/18.x llvmorg-18.1.0-rc3-0-g6c90f8dd5463.