Merge duplicate branches in switch/case statements
Summary: Simplify code by merging statements which contain the very same code.
Test Plan: Read and compare code.
Reviewers: O1 Blessed Committers, mainframe98
Reviewed By: O1 Blessed Committers, mainframe98
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Differential Revision: https://we.phorge.it/D26479