Sema: Fix two unused variable warnings

Author: slavapestov

lib/Sema/CSApply.cpp

@@ -6276,9 +6276,6 @@ void ExprRewriter::peepholeDictionaryUpcast(DictionaryExpr *expr,
   // the expr type as well.
   expr->setType(toType);
 
-  ConstraintLocatorBuilder keyLocator =
-    locator.withPathElement(
-      ConstraintLocator::PathElement::getGenericArgument(0));
   ConstraintLocatorBuilder valueLocator =
     locator.withPathElement(
       ConstraintLocator::PathElement::getGenericArgument(1));

lib/Sema/TypeCheckProtocol.cpp

@@ -3996,7 +3996,7 @@ void swift::useObjectiveCBridgeableConformances(DeclContext *dc, Type type) {
               if (!hashableProto)
                 return Action::Stop;
 
-              auto result = tc.conformsToProtocol(
+              (void)tc.conformsToProtocol(
                   keyType, hashableProto, DC, options,
                   /*ComplainLoc=*/SourceLoc());
             }