add library_async.js

For kripken/emscripten-fastcomp#39

All fixed. :)


On Tue, Jul 22, 2014 at 5:12 PM, Alon Zakai <notifications@github.com>
wrote:

> In emscripten.py:
>
> > @@ -1075,6 +1075,14 @@ def keyfunc(other):
> >          basic_vars += ['___rand_seed']
> >
> >        asm_runtime_funcs = ['stackAlloc', 'stackSave', 'stackRestore', 'setThrew', 'setTempRet0', 'getTempRet0']
> > +
> > +      # See if we need ASYNCIFY functions
> > +      # We might not need them even if ASYNCIYF is enabled
>
> typo in the bold part
>
> —
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> <https://github.com/kripken/emscripten/pull/2482/files#r15265155>.
>