[clang] [clang][LoongArch] Add FreeBSD targets (PR #119191)

[WÁNG Xuěruì via cfe-commits]

xen0n wrote:

> A bit late to the party here, but where is development of FreeBSD for LoongArch taking place? I don't see any traces of it in upstream yet.

Now there is -- they have just posted https://reviews.freebsd.org/D59889 and the entire initial enablement patchset. Seems it's working on QEMU which is a good starting point.

https://github.com/llvm/llvm-project/pull/119191