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Commit ad70d968 authored by Rafael Espindola's avatar Rafael Espindola
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Warn that -O4 is the same as -O3. 

We error on -O5 and higher. While it is tempting to do the same for -O4, I
agree with Jordan Rose: we should warn for a release at least first.

llvm-svn: 189369
parent 46e59b05
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