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[SimplifyCFG] NFC, update Switch tests as a baseline.

Description

[SimplifyCFG] NFC, update Switch tests as a baseline.

Also add baseline tests to show effect of later patches.

There were a couple of regressions here that were never caught,
but my patch set that this is a preparation to will fix them.

This is the third attempt to land this patch.

Differential Revision: https://reviews.llvm.org/D61150