8039498: Add iterators to GrowableArray Summary: To simplify the management of multiple code heaps in the code cache (see JDK-8015774), STL-style iterator capability is added to the GrowableArray. Further, custom iterators allow to only iterate over elements that satisfy a given predicate. Reviewed-by: kvn, twisti Contributed-by: Tobias Hartmann <tobias.hartmann@oracle.com>

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