Merge pull request swiftlang#34508 from slavapestov/fix-silgen-warning

SILGen: Fix an unused variable warning

Author: slavapestov

lib/SILGen/ResultPlan.cpp

@@ -452,12 +452,9 @@ class TupleInitializationResultPlan final : public ResultPlan {
 };
 
 class ForeignAsyncInitializationPlan final : public ResultPlan {
-  SILGenFunction &SGF;
   SILLocation loc;
 public:
-  ForeignAsyncInitializationPlan(SILGenFunction &SGF, SILLocation loc)
-    : SGF(SGF), loc(loc) {
-  }
+  ForeignAsyncInitializationPlan(SILLocation loc) : loc(loc) {}
 
   void
   gatherIndirectResultAddrs(SILGenFunction &SGF, SILLocation loc,
@@ -575,7 +572,7 @@ ResultPlanPtr ResultPlanBuilder::buildTopLevelResult(Initialization *init,
     // Create a result plan that gets the result schema from the completion
     // handler callback's arguments.
     // completion handler.
-    return ResultPlanPtr(new ForeignAsyncInitializationPlan(SGF, loc));
+    return ResultPlanPtr(new ForeignAsyncInitializationPlan(loc));
 
   } else if (auto foreignError = calleeTypeInfo.foreign.error) {
     // Handle the foreign error first.