[LLVMbugs] BreakCriticalEdges and DominanceFrontier

[Casey Carter]

I thought it should be both easy and consistent for BreakCriticalEdges 
to update DominanceFrontier information - I was right.

Also, I changed BreakCriticalEdges to name the new block that spits the 
edge between blocks bb0 and bb1 "bb0.bb1": this makes it a little easier 
for me to understand the output of my PRE pass.  This is purely a style 
issue, and has no technical merit, so feel free to reject this part of 
the patch.

-- 
Casey Carter
Casey at Carter.net
ccarter at uiuc.edu
AIM: cartec69

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