[clang] [clang][ASTImporter] Only reorder fields of RecordDecls (PR #77079)

[Balázs Kéri via cfe-commits]

balazske wrote:

I can not check what caused exactly the problems but the change looks correct and in change D154764 there seems to be no reason for re-ordering at non-record objects. As an improvement, some tests could be added that check for re-ordering  at `RecordDecl` and (this is the more important) no re-ordering at `ObjCInterfaceDecl`.

https://github.com/llvm/llvm-project/pull/77079