[libtooling] Support UnresolvedLookupExpr

Summary: [libtooling] Support UnresolvedLookupExpr

Test Plan:
DEBUG=1 make -C libtooling clean all
make -C libtooling clean test
make -C clang-ocaml clean
make -C clang-ocaml test

Reviewers: mathieubaudet

Reviewed By: mathieubaudet

Subscribers: ergin, cristianoc, martinoluca, ddino, dulmarod

Differential Revision: https://phabricator.fb.com/D1486832

Tasks: 3964417
[libtooling] Add missing field_prefix to expr_with_cleanups_info

Summary: [libtooling] Add missing field_prefix to expr_with_cleanups_info

Test Plan:
DEBUG=1 make -C libtooling clean all
make -C libtooling clean test
make -C clang-ocaml clean
make -C clang-ocaml test

Reviewers: mathieubaudet

Reviewed By: mathieubaudet

Subscribers: ergin

Differential Revision: https://phabricator.fb.com/D1486836

Tasks: 3964417
[libtooling] Support more fields for NamespaceDecl

Summary: [libtooling] Support more fields for NamespaceDecl

Test Plan:
DEBUG=1 make -C libtooling clean all
make -C libtooling clean test
make -C clang-ocaml clean
make -C clang-ocaml test

Reviewers: mathieubaudet

Reviewed By: mathieubaudet

Subscribers: cristianoc, martinoluca, ddino, dulmarod

Differential Revision: https://phabricator.fb.com/D1487184

Tasks: 3964417