Use slices instead of locationsHEADmaster

In the C API, we want to use slices instead of locations in the
AST. In this case a "slice" is effectively the same thing as the
location, expect it is represented using a 32-bit offset and a
32-bit length. This will cut down on half of the space of all of
the locations in the AST.

Note that from the Ruby/Java/JavaScript side, this is effectively
an invisible change. This only impacts the C/Rust side.

0 files changed, 0 insertions, 0 deletions