Split FIXME into multiple multi line comments.

FIXME syntax is less flexible on 4.32 according to CI.

fix compatibility with current nightly builds

Empty commit to hopefully trigger github actions

fix unit tests under recent HHVM

Fix Node::__construct $children type

Hack now typechecks XHP constructors (facebook/hhvm@af6f350)
which revealed this error.

Fix :xhp::__construct $children type

Hack now typechecks XHP constructors (facebook/hhvm@af6f350)
which revealed this error.

Remove assert calls refine local instead of array index

Replace travis with github

specify demangle options for running autoloader and tests

add namespace-related flags

defaults changed in HHVM 4.73