Re: Fix PR 53743 and other -freorder-blocks-and-partition failures (issue6823047)

[Jan Hubicka]

> There shouldn't be any forwarder blocks in cfg layout mode. What did
> you need this for?
> 
> BTW2: We badly need to figure out a way to create test cases for FDO... :-(

We have gcc.dg/tree-prof and friends.  What do you need to add?

Honza