/usr/lib/ocaml/llvm-3.4/libLLVMMipsAsmPrinter.a is in libllvm-3.4-ocaml-dev 1:3.4-1ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ocaml/llvm-3.4/../../llvm-3.4/lib/libLLVMMipsAsmPrinter.a