Merge pull request #41095 from gottesmm/pr-df3640638d2f7ea3d3bb5a1f08c432cbf99069ca

[no-implicit-copy] Make sure to error on copies on borrowed structural sub-values.

Author: gottesmm

include/swift/SIL/OwnershipUtils.h

@@ -182,6 +182,11 @@ class ForwardingOperand {
     return use->getOwnershipConstraint();
   }
 
+  bool isDirectlyForwarding() const {
+    auto &mixin = *OwnershipForwardingMixin::get(use->getUser());
+    return mixin.isDirectlyForwarding();
+  }
+
   ValueOwnershipKind getForwardingOwnershipKind() const;
   void setForwardingOwnershipKind(ValueOwnershipKind newKind) const;
   void replaceOwnershipKind(ValueOwnershipKind oldKind,

include/swift/SIL/PrunedLiveness.h

@@ -348,6 +348,11 @@ struct PrunedLivenessBoundary {
   SmallVector<SILInstruction *, 8> lastUsers;
   SmallVector<SILBasicBlock *, 8> boundaryEdges;
 
+  void clear() {
+    lastUsers.clear();
+    boundaryEdges.clear();
+  }
+
   /// Visit the point at which a lifetime-ending instruction must be inserted,
   /// excluding dead-end blocks. This is only useful when it is known that none
   /// of the lastUsers ends the lifetime, for example when creating a new borrow