Merge pull request swiftlang#40467 from atrick/fix-autodiff-ownership

Fix OperandOwnership for AutoDiff builtins.

Author: atrick

lib/SIL/IR/OperandOwnership.cpp

@@ -856,9 +856,8 @@ BUILTIN_OPERAND_OWNERSHIP(InteriorPointer, DestroyDefaultActor)
 
 BUILTIN_OPERAND_OWNERSHIP(InteriorPointer, InitializeDistributedRemoteActor)
 
-// FIXME: Why do these reqiuire a borrowed value at all?
-BUILTIN_OPERAND_OWNERSHIP(ForwardingBorrow, AutoDiffAllocateSubcontext)
-BUILTIN_OPERAND_OWNERSHIP(ForwardingBorrow, AutoDiffProjectTopLevelSubcontext)
+BUILTIN_OPERAND_OWNERSHIP(PointerEscape, AutoDiffAllocateSubcontext)
+BUILTIN_OPERAND_OWNERSHIP(PointerEscape, AutoDiffProjectTopLevelSubcontext)
 
 // FIXME: ConvertTaskToJob is documented as taking NativePointer. It's operand's
 // ownership should be 'TrivialUse'.