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Chris Lattner a376aae246 Use isNull instead of getNode() to test for existence of a node, this is cheaper. 
FIX MAJOR BUG, whereby we didn't merge null edges correctly. Correcting this
fixes poolallocation on 175.vpr, and possibly others.

llvm-svn: 11695
 		2004-02-22 00:53:54 +00:00
llvm Use isNull instead of getNode() to test for existence of a node, this is cheaper. 2004-02-22 00:53:54 +00:00