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.