tree df1741bade00fb72d7a3e306933d666c2e063a46
parent 0bd920eb9d44e98c33e6462eab787b15bbd731dc
author alan-baker <alanbaker@google.com> 1614717656 -0500
committer GitHub <noreply@github.com> 1614717656 -0500
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Require an OpSelectionMerge before an OpSwitch (#4154)

Fixes #4153

* OpSwitch is required to be preceeded by OpSelectionMerge
* Update newly invalid tests