Eliminate the additional resolving phase of compilation for better performance

We should try to eliminate the additional resolving phase of compilation:

            if (phase == Phases.SEMANTIC_ANALYSIS) {
                doPhaseOperation(resolve);
                if (dequeued()) continue;
            }

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http://groovy.329449.n5.nabble.com/About-the-additional-resolving-phase-of-compilation-tt5752846.html

Hi all, 

      As we all know, resolving is quite complicated and time consuming in 
Groovy, but the resolving is applied twice currently. The additional 
resolving is applied here: 
https://github.com/apache/groovy/blob/master/src/main/java/org/codehaus/groovy/control/CompilationUnit.java#L581-L584

      If the additional resoving is removed, only one test fails. 

      Could you recall why we have to resolve twice? And can we try to apply 
resolving only once for better performance? 

Cheers, 
Daniel.Sun 

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I think that is worth exploring. There was a valid reason but I can't remember just now.
I'll try to jog my memory from the code/mailing archives.

FYI, I was thinking in fact we might have to go the other way. And repeat also Canonical.
That way our Java stubs would be much better for joint compilation. We'd have to
make a whole lot of steps idempotent before that would work though. If we do it right,
we could skip a lot the second time through - which we might even be able to improve
for the current repeated phase.
 
Cheers, Paul.