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Removes the `files` field from the Wasm linker, storing the ZigObject
as its own field instead using a tagged union.
This removes a layer of indirection when accessing the ZigObject, and
untangles logic so that we can introduce a "pre-link" phase that
prepares the linker state to handle only incremental updates to the
ZigObject and then minimize logic inside flush().
Furthermore, don't make array elements store their own indexes, that's
always a waste.
Flattens some of the file system hierarchy and unifies variable names
for easier refactoring.
Introduces type safety for optional object indexes.
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This introduces some type safety so we cannot accidently give an atom
index as a symbol index. This also means we do not have to store any
optionals and therefore allow for memory optimizations. Lastly, we can
now always simply access the symbol index of an atom, rather than having
to call `getSymbolIndex` as it is easy to forget.
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We cannot keep function indexes as maxInt(u32) due to functions being
dedupliated when they point to the same function. For this reason we now
use a regular arraylist which will have new functions appended to, and
when deleted, its index is appended to the free list, allowing us to
re-use slots in the function list.
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We now parse the decls right away into atoms and allocate the
corresponding linker-object, such as segment and function, rather than
waiting until `flushModule`.
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This function was previously only called by the backend which generates
a synthetical function that is not represented by any AIR or Zig code.
For this reason, the ownership is moved to the zig-object and stored
there so it can be linked with the other object files without the driver
having to specialize it.
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