Kyle Butt d2b886e569 Codegen: Tail Duplication: Only duplicate into layout pred if it is a CFG Pred. ...

Add a check that the layout predecessor of a block is an actual CFG
predecssor of the block as well. No current code fails this check, but
upcoming patches can trigger this, and it makes sense to separate it
out.

llvm-svn: 276066

2016-07-20 00:01:51 +00:00

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