Compile with -O3 by default #146

1. 
   sipa commented at 0:31 am on December 9, 2014: contributor

   Seems to give some benefit both for gcc and clang, and more than individual optimizations that are enabled by it. I also tried some further optimizations that are not enabled by -O3, but they seem to have no effect or slow down.
2. Compile with -O3 by default c88e2b8cca
3. sipa cross-referenced this on Dec 9, 2014 from issue Default release compilation with -O3 by sipa
4. 
   gmaxwell commented at 9:56 am on December 9, 2014: contributor

   ACK.
5. sipa merged this on Dec 9, 2014
6. sipa closed this on Dec 9, 2014

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7. sipa referenced this in commit 74ad63a9e5 on Dec 9, 2014

Contributors
sipa gmaxwell