fusion of loops in Range.foreach() and Range.validateRangeBoundaries()

This commit allows closure elimination in more cases. The non-inlined case also benefits from saving a Range.validateRangeBoundaries() invocation.

Before this commit, the closure argument to Range.foreach() escaped to Range.validateRangeBoundaries(). As a consequence, closure elimination required inlining both of them. Given that the current optimizer duplicates a closure body whenever that closure's apply() is invoked, the resulting code size taxed the JIT compiler. In particular when apply() delegates to a specialized version, or when a bridge apply() stands in the way.

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