Add new tests (#2168)
Fixes a wasm2c bug where instantiation was initializing memories before
tables. The spec requires tables to be initialized before memories
(newly tested in the multi-memory linking0 test).
Remaining missing tests are:
- multi-memory/memory_copy1.txt (currently blank)
- relaxed-simd/relaxed_dot_product.txt
(we don't support the i16x8.relaxed_dot_i8x16_i7x16_s instruction)
And for wasm2c only:
- five SIMD tests
(https://github.com/WebAssembly/wabt/pull/2021#issuecomment-1396386135)
- all relaxed-simd and tail-call tests
