Continuing to press on RefChecks, discovered wh...

Continuing to press on RefChecks, discovered what seemed a pretty
spectacular performance bug, at least at first. I was disappointed to
see that the time gain didn't measure up. Still, nanos are nanos.

According to YourKit, millis spent in List#foreach on a compilation of
src/library broke down like this:

|  +---LinearSeqOptimized$class.foreach               |  173,123  100 %  |
|    +---RefChecks$RefCheckTransformer.register$1     |  117,658   68 %  |

I think that is largely a profiler lie, but there is enough truth. After
adjusting to prune before recursing, the number of invocations of method
register in validateBaseTypes drops by 98%.

Review by odersky.

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