[clang] [llvm] [LoongArch] Support LA V1.1 feature ld-seq-sa that don't generate dbar 0x700. (PR #116762)

[Lu Weining via llvm-commits]

https://github.com/SixWeining approved this pull request.

LGTM. But we can also add this feature in `sys::getHostCPUFeatures` in this PR.

https://github.com/llvm/llvm-project/pull/116762