ntdll: Don't detect epilogue in chained unwind function on x64. Fixes a regression introduced by 052722667c9dbf96a5dc04d45af55599718d9f92.
ntdll: Check for related functions in is_inside_epilog() when detecting tail call. Fixes a regression introduced by 052722667c9dbf96a5dc04d45af55599718d9f92.