* Wasmtime: Rename `IndexAllocator` to `ModuleAffinityIndexAllocator`
We will have multiple kinds of index allocators soon, so clarify which one this
is.
* Wasmtime: Introduce a simple index allocator
This will be used in future commits refactoring the pooling allocator.
* Wasmtime: refactor the pooling allocator for components
We used to have one index allocator, an index per instance, and give out N
tables and M memories to every instance regardless how many tables and memories
they need.
Now we have an index allocator for memories and another for tables. An instance
isn't associated with a single instance, each of its memories and tables have an
index. We allocate exactly as many tables and memories as the instance actually
needs.
Ultimately, this gives us better component support, where a component instance
might have varying numbers of internal tables and memories.
Additionally, you can now limit the number of tables, memories, and core
instances a single component can allocate from the pooling allocator, even if
there is the capacity for that many available. This is to give embedders tools
to limit individual component instances and prevent them from hogging too much
of the pooling allocator's resources.
* Remove unused file
Messed up from rebasing, this code is actually just inline in the index
allocator module.
* Address review feedback
* Fix benchmarks build
* Fix ignoring test under miri
The `async_functions` module is not even compiled-but-ignored with miri, it is
completely `cfg`ed off. Therefore we ahve to do the same with this test that
imports stuff from that module.
* Fix doc links
* Allow testing utilities to be unused
The exact `cfg`s that unlock the tests that use these are platform and feature
dependent and ends up being like 5 things and super long. Simpler to just allow
unused for when we are testing on other platforms or don't have the compile time
features enabled.
* Debug assert that the pool is empty on drop, per Alex's suggestion
Also fix a couple scenarios where we could leak indices if allocating an index
for a memory/table succeeded but then creating the memory/table itself failed.
* Fix windows compile errors
Nick Fitzgerald
a34427a3d2