In Embedded Swift, the `String` type is unavailable. This means that the
overload of `fatalError()` that takes a `String` is also unavailable. Specify a
`StaticString` in the setter for `TaskLocal.projectedValue` to satisfy this
constraint.
These modules import Darwin which is not in ossa. -enable-ossa-modules
results in a one-time recompilation of dependencies when they are not in ossa.
This is not compatible with Explicit Build Modules when the original invocation
did not have -enable-ossa-modules.
We should build a 64-bit value from the two 32-bit Id fields, but we were shifting one field by the other. Coincidentally, this managed to produce the correct value until the ID goes beyond 2^32, but after that it's weird and wrong.
There cannot be undefined behavior at compile time, so these warnings can be
ignored when `offsetof` is used in a static assert:
```
warning: offset of on non-standard-layout type 'AsyncTask' [-Winvalid-offsetof]
```
Replace NextLinkType with Item::Kind with more clear definition.
Use llvm::PointerIntPair<>.
Use hierarchy of classes instead of optional fields inside Item.
Combined Storage::copyToOnlyOnlyFromCurrentGroup() into Storage::initializeLinkParent().
Also create parent task marker when copying items created inside withTaskGroup().
Removed Storage::peekHeadLinkType().
rdar://138085348
Even though errors are ObjC boxes, they can't be tagged pointers and in fact may use that bit to store enum tags, so treating them like regular ObjC references here can cause ref count issues.
`Builtin.FixedArray<let N: Int, T: ~Copyable & ~Escapable>` has the layout of `N` elements of type `T` laid out
sequentially in memory (with the tail padding of every element occupied by the array). This provides a primitive
on which the standard library `Vector` type can be built.
In Xcode 16 SDKs there seem to be two `errno` visible for some files,
one in the `Darwin` module, and one in the `_errno` module (which seems
new for this Xcode version).
Disambiguate the references by prepending `Darwin`, which should be the
one that was being used before Xcode 16 SDKs.
Also remove the code that deals with file descriptors; we will now
only start the backtracer for processes that have the get-task-allow
entitlement, which means that they've been specifically signed for
debugging, and *that* means that it is no longer critical to ensure
that unexpectedly inherited fds are closed.
rdar://137551812
