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`Symbol.getFlag`, 'Symbol.hasFlag`, `Symbol.hasAllFlags`, `Symbol.annotations`
and `Symbol.privateWithin` now trigger automatic initialization of symbols
if they are used in a runtime reflection universe and some other conditions
are met (see `Symbol.needsInitialize` for details).
As the performance testing in https://github.com/scala/scala/pull/1380 shows,
this commit introduces a ~2% performance regression of compilation speed.
Unfortunately all known solutions to the bug at hand (A, B & C - all of those)
introduce perf regressions (see the pull request linked above for details).
However we're under severe time pressure, so there's no more time to explore.
Therefore I suggest this is reasonable to accept this performance hit,
because we've just gained 6% from removing scala.reflect.base,
and even before that we were well within our performance goal for 2.10.0-final.
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