[Typechecker] When creating the pattern binding for the backing variable, use the original property's static spelling

Author: theblixguy

lib/Sema/TypeCheckStorage.cpp

@@ -2348,8 +2348,8 @@ PropertyWrapperBackingPropertyInfoRequest::evaluate(Evaluator &evaluator,
   pbdPattern->setType(storageType);
   pbdPattern = TypedPattern::createImplicit(ctx, pbdPattern, storageType);
   auto pbd = PatternBindingDecl::createImplicit(
-      ctx, backingVar->getCorrectStaticSpelling(), pbdPattern,
-      /*init*/nullptr, dc, SourceLoc());
+      ctx, var->getCorrectStaticSpelling(), pbdPattern,
+      /*init*/ nullptr, dc, SourceLoc());
   addMemberToContextIfNeeded(pbd, dc, var);
   pbd->setStatic(var->isStatic());