* Fix double-counting imports in `VMOffsets` calculations
This fixes an oversight in the initial creation of `VMOffsets` for a
module to avoid double-counting imported globals, tables, and memories
for calculating the size of the `VMContext`. Prior to this PR imported
items are accidentally also counted as defined items for sizing
calculations meaning that when a memory is imported but not defined, for
example, the `VMContext` will have a space for an inline
`VMMemoryDefinition` when it doesn't need to.
Auditing where all this relates to it appears that the only issue from
this mistake is that `VMContext` is a bit larger than it would otherwise
need to be. Extra slots are uninitialized memory but nothing in Wasmtime
ever actually accesses the memory either, so it should be harmless to
have extra space here. Nevertheless it seems better to shrink the size
as much as possible to avoid wasting space where we can.
* Fix tests
9f5f978baa