[CoroutineAccessors] Only reference when available

Don't bind references to storage to use (new ABI) coroutine accessors
unless they're guaranteed to be available.  For example, when building
against a resilient module that has coroutine accessors, they can only
be used if the deployment target is >= the version of Swift that
includes the feature.

rdar://148783895

lib/SILGen/SILGenPattern.cpp

@@ -3323,11 +3323,13 @@ static bool isBorrowableSubject(SILGenFunction &SGF,
   if (!storage) {
     return false;
   }
-  
+
+  auto pair = std::make_pair<>(subjectExpr->getSourceRange(), SGF.FunctionDC);
+
   // Check the access strategy used to read the storage.
   auto strategy =
       storage->getAccessStrategy(access, AccessKind::Read, SGF.SGM.SwiftModule,
-                                 SGF.F.getResilienceExpansion(),
+                                 SGF.F.getResilienceExpansion(), pair,
                                  /*useOldABI=*/false);
 
   switch (strategy.getKind()) {