optimization that doesn't make recompilation be needed more often?

[Isaac Dupree]

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Could there be a flag weaker than -O that doesn't cause recompilation
any more than -O0 does -- would that provide any worthwhile
optimizations?  (an intermediate speed-tradeoff option for haskell
developers.)  Dependency on the details of modules never expected to be
recompiled (e.g. base library, or any package not currently being
compiled, but those are just heuristics) should be fine.

Wondering,

Isaac
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