Refactor Native Image heap scanning. #3926
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The universe parameter is not necessary.
It is used to guarantee that ComputedValueFields are available when they are read.
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Scan the image heap during analysis, concurrently with type flow propagation, to avoid scanning from roots multiple times. This eliminates the
(objects)image build phase, i.e., the old, repeated scanning from roots, and it should improve the image build time for images with large heaps.