r189150 - Add note about following two commands are no longer equivalent.
rafael.espindola at gmail.com
Sun Aug 25 09:18:36 PDT 2013
This is a more user facing document, so it is probably a good idea to
say when each should be used. Also, -O3 is irrelevant here, -ftto and
-emit-llvm are now different, with any -O level.
I would suggest something on the lines of "-emit-llvm no longer
implies LTO, users should use -flto instead".
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