git: b1c73532ee89..312c0ed19cc5 - vendor/llvm-project/main - vendor branch updated

[Dimitry Andric]

The branch vendor/llvm-project/main has been updated by dim:

URL: https://cgit.FreeBSD.org/src/log/?id=b1c73532ee89..312c0ed19cc5

312c0ed19cc5 Vendor import of llvm-project main 
llvmorg-18-init-15088-gd14ee76181fb.