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Commit 1a951066 authored by Dan Gohman's avatar Dan Gohman
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Teach SimplifyCFG how to eliminate duplicate PHI nodes within a block. 

This reduces codesize on a variety of codes by 1-2% on x86-64. It also
helps clean up after SSAUpdater.

llvm-svn: 85626
parent 74eb5d71
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