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Chris Lattner 4ed40f7c6f Fix a problem that instcombine would hit when dealing with unreachable code. 
Because the instcombine has to scan the entire function when it starts up
to begin with, we might as well do it in DFO so we can nuke unreachable code.

This fixes: Transforms/InstCombine/2005-07-07-DeadPHILoop.ll

llvm-svn: 22348
 		2005-07-07 20:40:38 +00:00
llvm Fix a problem that instcombine would hit when dealing with unreachable code. 2005-07-07 20:40:38 +00:00