Greatly increase the amount of private storage in a task.

It's already nearly full, and there's plenty of stuff we're not
tracking properly yet.

Author: rjmccall

include/swift/ABI/MetadataValues.h

@@ -48,7 +48,7 @@ enum {
   NumWords_DefaultActor = 12,
 
   /// The number of words in a task.
-  NumWords_AsyncTask = 16,
+  NumWords_AsyncTask = 24,
 
   /// The number of words in a task group.
   NumWords_TaskGroup = 32,

include/swift/ABI/Task.h

@@ -203,7 +203,7 @@ class AsyncTask : public Job {
 
   /// Private storage for the use of the runtime.
   struct alignas(2 * alignof(void*)) OpaquePrivateStorage {
-    void *Storage[6];
+    void *Storage[14];
 
     /// Initialize this storage during the creation of a task.
     void initialize(AsyncTask *task);