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Author SHA1 Message Date
Dan Gohman 22571485b3 Change PHINode::hasConstantValue to have a DominatorTree argument 
instead of a bool argument, and to do the dominator check itself.
This makes it eaiser to use when DominatorTree information is
available.

llvm-svn: 80920
 2009-09-03 15:34:35 +00:00
Chris Lattner c40039c736 don't require GVN to work on dead values, just make the 
test return the loaded value.

llvm-svn: 60252
 2008-11-29 21:21:48 +00:00
Owen Anderson b22a640fe4 A better fix for PR2503 that doesn't pessimize GVN in the presence of unreachable blocks. 
llvm-svn: 53032
 2008-07-02 17:20:16 +00:00