Add support for the reference types proposal (#938)

* Add support for the reference types proposal

This commit adds support for the reference types proposal to wabt.
Namely it adds new opcodes like `table.{get,set,grow}` as well as adds a
new `anyref` type. These are plumbed throughout for various operations
in relatively simple fashions, no support was added for a subtyping
relationship between `anyref` and `anyfunc` just yet.

This also raises the restriction that multiple tables are disallowed,
allowing multiple tables to exist when `--enable-reference-types` is
passed.

* Allow nonzero table indices in `call_indirect`

Plumb support throughout for the `call_indirect` instruction (and
`return_call_indirect`) to work with multi-table modules according to
the reference types proposal.

0 files changed, 0 insertions, 0 deletions