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Commit 16547324 authored by Jakob Stoklund Olesen's avatar Jakob Stoklund Olesen
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Don't look for empty live ranges in the unions. 

Empty live ranges represent undef and still get allocated, but they
won't appear in LiveIntervalUnions.

Patch by Patrik Hägglund!

llvm-svn: 156685
parent 1a362fbb
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