Disable GenericSpecializer for @guaranteed results

Author: meg-gupta

lib/SILOptimizer/Transforms/GenericSpecializer.cpp

@@ -112,7 +112,9 @@ bool swift::specializeAppliesInFunction(SILFunction &F,
       // temporary stack location and returns a projection from the
       // store_borrow. This does not work for borrow accessors that return the
       // projection from within the store_borrow scope.
-      if (F.hasOwnership() && Callee->getConventions().hasAddressResult()) {
+      if (F.hasOwnership() &&
+          (Callee->getConventions().hasAddressResult() ||
+           Callee->getConventions().hasGuaranteedResult())) {
         continue;
       }