[Concurrency] Fix ptr auth for task priority escalation handler

[ktoso]

We missed to sign the handler. Along the way the signature of it changed, so adjust for that.

How to get the number:

func PROPER(bar: (TaskPriority, TaskPriority) -> Void) {
   let p = TaskPriority.default
   bar(p, p)
}

-> % swiftc -target arm64e-apple-macos13 example.swift -S -o - | swift demangle | grep -a3 autda
            stur    x8, [x29, #-64]
            mov     x17, x8
            movk    x17, #11839, lsl #48 <<<<<<<<<
            autda   x16, x17
            ldr     x8, [x16, #64]
            lsr     x8, x8, #0
            add     x8, x8, #15

Resolves rdar://150378890

[ktoso]

@swift-ci please smoke test

[rjmccall]

LGTM. You should separately make sure that the function pointer is stored with reasonable diversity in the status record, but that's not necessary to fix the bug.

[ktoso]

Thank you!

Yup, we have that

class EscalationNotificationStatusRecord : public TaskStatusRecord {
public:
  using FunctionType = SWIFT_CC(swift) void(JobPriority, JobPriority, SWIFT_CONTEXT void *);

private:
  FunctionType *__ptrauth_swift_escalation_notification_function Function;