This adds support for the loongarch64 architecture to the offload host plugin. Similar to #115773 To fix some test issues, I've had to add the LoongArch64 target to: - CompilerInvocation::ParseLangArgs - linkDevice in ClangLinuxWrapper.cpp - OMPContext::OMPContext (to set the device_kind_cpu trait) Reviewed By: jhuber6 Pull Request: https://github.com/llvm/llvm-project/pull/120173