The files in this directory are copied verbatim from the PNaCl repository. They
are ultimately needed by PNaClTranslator.cpp.
Individual files are copied from:
https://chromium.googlesource.com/native_client/pnacl-llvm/+/master/include/llvm/Bitcode/NaCl/
https://chromium.googlesource.com/native_client/pnacl-llvm/+/master/lib/Bitcode/NaCl/Reader/
Only the files needed for compiling and linking pnacl-sz are copied.