Move prepare, lowerNonArrayAggregate and lowerArrayAggregate methods to statementsem

[dchidindu5]

Is there a need to update frontend.h or? @thewilsonator

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[thewilsonator]

No, they are all private (and most of them are extern(D)

[thewilsonator]

Also did you mean to close this?

[dchidindu5]

Also did you mean to close this?

I'll reopen it.

[dchidindu5]

Just saw this from the test suite @thewilsonator

 fail_compilation/test21939.d(11): Error: invalid `;` aggregate `Object` of type `Object`
  fail_compilation/test21939.d(11):        `foreach` works with input ranges (implementing `front` and `popFront`), aggregates implementing `opApply`, or the result of an aggregate's `.tupleof` property

[thewilsonator]

That looks like you messed up the token passed to en error somewhere, but it is very strange that it only happens on a few platforms. Will take a look tomorrow.