The fast path of to_i32() can be neatly inlined everywhere, and we still
have to_i32_slow_case() for non-trivial conversions.
For to_u32(), it really can just be implemented as a static cast to i32!
Previously this was proxying the call through javascript, which lead to
unexpected crashes when functions returned things that js-api did not
like.
This commit also adds in the spec comments and fixes a few inaccuracies
that were present in the process.
Add support for shared memory creation in WebAssembly memory API.
This API is needed for WPT tests that use shared array buffers.
Import related WPT tests.
Resulting in a massive rename across almost everywhere! Alongside the
namespace change, we now have the following names:
* JS::NonnullGCPtr -> GC::Ref
* JS::GCPtr -> GC::Ptr
* JS::HeapFunction -> GC::Function
* JS::CellImpl -> GC::Cell
* JS::Handle -> GC::Root
The main motivation behind this is to remove JS specifics of the Realm
from the implementation of the Heap.
As a side effect of this change, this is a bit nicer to read than the
previous approach, and in my opinion, also makes it a little more clear
that this method is specific to a JavaScript Realm.
