Previously, each pair of promise resolving functions allocated a
dedicated AlreadyResolved GC cell to hold a single shared bool. Move the
bit onto the resolve function as a plain member, and have the reject
function reach it through a GC::Ptr back to its paired resolve function.
Every Promise allocates two PromiseResolvingFunction cells (resolve and
reject). Each cell stored an AK::Function holding a closure, but neither
closure captured anything beyond the Promise and AlreadyResolved already
present as cell fields.
Hoist the two closure bodies into static functions on Promise and
dispatch by a Kind enum on the cell. This removes the AK::Function
storage embedded in each cell along with its off-GC malloc'd closure
capture.
This reverts commit c14173f651. We
should only annotate the minimum number of symbols that external
consumers actually use, so I am starting from scratch to do that
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
