internal/task: use asyncify on webassembly

This change implements a new "scheduler" for WebAssembly using binaryen's asyncify transform.
This is more reliable than the current "coroutines" transform, and works with non-Go code in the call stack.

runtime (js/wasm): handle scheduler nesting

If WASM calls into JS which calls back into WASM, it is possible for the scheduler to nest.
The event from the callback must be handled immediately, so the task cannot simply be deferred to the outer scheduler.
This creates a minimal scheduler loop which is used to handle such nesting.

1 files changed, 0 insertions, 0 deletions

diff --git a/lib/binaryen b/lib/binaryen
new file mode 160000
+Subproject 96f7acf09aae1ec6e8bc573dfa8f309c4f892a4