[clang] NFC, simplify the code in CheckExprLifetime.cpp (#99637)

Summary:
No need to get the Owner/Pointer attr via the type. The Decl has this
attr information.

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Differential Revision: https://phabricator.intern.facebook.com/D60251260

Author: hokein

clang/lib/Sema/CheckExprLifetime.cpp

@@ -308,8 +308,7 @@ static bool shouldTrackFirstArgument(const FunctionDecl *FD) {
   const auto *RD = FD->getParamDecl(0)->getType()->getPointeeCXXRecordDecl();
   if (!FD->isInStdNamespace() || !RD || !RD->isInStdNamespace())
     return false;
-  if (!isRecordWithAttr<PointerAttr>(QualType(RD->getTypeForDecl(), 0)) &&
-      !isRecordWithAttr<OwnerAttr>(QualType(RD->getTypeForDecl(), 0)))
+  if (!RD->hasAttr<PointerAttr>() && !RD->hasAttr<OwnerAttr>())
     return false;
   if (FD->getReturnType()->isPointerType() ||
       isRecordWithAttr<PointerAttr>(FD->getReturnType())) {