An index structure is created while generating the output file for each
info. This structure is parsed to JSON and written to a file in the
output directory. The html for the index is not rendered by clang-doc. A
Javascript file is included in the output directory, this will the JSON
file and insert HTML elements into the file.
Differential Revision: https://reviews.llvm.org/D65690
llvm-svn: 368070