[libtooling] Support MaterializeTemporaryExpr

Summary: [libtooling] Support MaterializeTemporaryExpr

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: ddino, cristianoc, martinoluca, dulmarod

Differential Revision: https://phabricator.fb.com/D1438371

Tasks: 3964417