Here is the planned schedule for the 9.0.1 Release:
Nov 22: -rc1
Dec 2: -rc2/Deadline to request backports
Dec 9: 9.0.1-final
If you want to make sure a fix makes it into the 9.0.1 release, please file
a bug at bugs.llvm.org and mark it as a blocker for the release-9.0.1 meta-bug.