Merge remote-tracking branch 'upstream/main' into mpokhylets/isolated-deinit

# Conflicts:
#	include/swift/Basic/Features.def
#	lib/SILGen/SILGenDestructor.cpp
#	test/Concurrency/flow_isolation.swift
#	test/abi/macOS/arm64/concurrency.swift
#	test/abi/macOS/x86_64/concurrency.swift

include/swift/ABI/Executor.h

@@ -124,6 +124,12 @@ public:
     return Identity;
   }
 
+  const char* getIdentityDebugName() const {
+    return isMainExecutor() ? " (MainActorExecutor)"
+           : isGeneric()    ? " (GenericExecutor)"
+                            : "";
+  }
+
   /// Is this the generic executor reference?
   bool isGeneric() const {
     return Identity == 0;
@@ -233,6 +239,10 @@ public:
     return TaskExecutorRef(identity, wtable);
   }
 
+  /// If the job is an 'AsyncTask' return its task executor preference,
+  /// otherwise return 'undefined', meaning "no preference".
+  static TaskExecutorRef fromTaskExecutorPreference(Job *job);
+
   HeapObject *getIdentity() const {
     return Identity;
   }
@@ -260,12 +270,6 @@ public:
     return reinterpret_cast<const TaskExecutorWitnessTable*>(table);
   }
 
-//  /// Do we have to do any work to start running as the requested
-//  /// executor?
-//  bool mustSwitchToRun(TaskExecutorRef newExecutor) const {
-//    return Identity != newExecutor.Identity;
-//  }
-
   /// Get the raw value of the Implementation field, for tracing.
   uintptr_t getRawImplementation() const {
     return Implementation & WitnessTableMask;