Add python tool to dump and construct header maps
Header maps are binary files used by Xcode, which are used to map
header names or paths to other locations. Clang has support for
those since its inception, but there's not a lot of header map
Since it's a binary format, testing becomes pretty much brittle
and its hard to even know what's inside if you don't have the
Add a python based tool that allows creating and dumping header
maps based on a json description of those. While here, rewrite
tests to use the tool and remove the binary files from the tree.
This tool was initially written by Daniel Dunbar.
Differential Revision: https://reviews.llvm.org/D46485