Kyle Butt 267164df0a Codegen: Fix broken assumption in Tail Merge. ...

Tail merge was making the assumption that a layout successor or
predecessor was always a cfg successor/predecessor. Remove that
assumption. Changes to tests are necessary because the errant cfg edges
were preventing optimizations.

llvm-svn: 273700

2016-06-24 18:16:36 +00:00

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