[clang] [clang][LoongArch] Add OHOS target (PR #127555)

[Pavel Kosov via cfe-commits]

kpdev wrote:

> LGTM for the LoongArch change. We'll see if @kpdev has any objections later.

LGTM also. Thank you for the patch

https://github.com/llvm/llvm-project/pull/127555