main/*: fix build for loongarch64

• main/llvm16: backport patch to fix rust build error on loongarch64
  https://github.com/llvm/llvm-project/issues/82330 , https://github.com/llvm/llvm-project/pull/82332

• main/clang16(17): create config.cfg for loongarch64

• main/llvm14(clang14): disable on loongarch64,and loongarch64 support since llvm16