git: fc0a8108a55a..703029dbba78 - vendor/llvm-project/release-17.x - vendor branch updated

[Dimitry Andric]

The branch vendor/llvm-project/release-17.x has been updated by dim:

URL: https://cgit.FreeBSD.org/src/log/?id=fc0a8108a55a..703029dbba78

703029dbba78 Vendor import of llvm-project branch release/17.x 
llvmorg-17.0.6-0-g6009708b4367.