Fix interior liveness to report the escaping instruction as a use.

Author: atrick

lib/SIL/Utils/OwnershipLiveness.cpp

@@ -150,6 +150,8 @@ struct InteriorLivenessVisitor :
 
   bool handlePointerEscape(Operand *use) {
     interiorLiveness.addressUseKind = AddressUseKind::PointerEscape;
+    if (!handleUsePoint(use, UseLifetimeConstraint::NonLifetimeEnding))
+      return false;
 
     return true;
   }

lib/SIL/Utils/OwnershipUtils.cpp

@@ -1110,12 +1110,11 @@ bool BorrowedValue::visitInteriorPointerOperandHelper(
       continue;
     }
 
-    // Look through object. SingleValueInstruction is overly restrictive but
-    // rules out any interesting corner cases.
+    // Look through object.
     if (auto *svi = dyn_cast<SingleValueInstruction>(user)) {
-      if (ForwardingInstruction::isa(user)) {
-        for (auto *use : svi->getUses()) {
-          worklist.push_back(use);
+      if (Projection::isObjectProjection(svi)) {
+        for (SILValue result : user->getResults()) {
+          llvm::copy(result->getUses(), std::back_inserter(worklist));
         }
         continue;
       }