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Commit a376aae2 authored by Chris Lattner's avatar Chris Lattner
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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
parent f3e2a636
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