Fix possible-contents.h for `array.new_{data,elem}` (#5232)

* Update MemoryPacking for array.new_data

The MemoryPacking pass looks at all instructions that reference memory segments
to determine how they can be optimized. #5214 introduced a new instruction that
references memory segments, array.new_data, but did not update MemoryPacking
accordingly. This omission meant that MemoryPacking could produce invalid or
misoptimized modules in the presence of array.new_data.

Fix the problem by making MemoryPacking aware of array.new_data. Consider
array.new_data when determining whether a segment is used and update
array.new_data to reflect the new, optimized segment numberings afterward. To
keep things simple, do not try to split any segment that is referred to by
a array.new_data instruction.

* fix

* Add test explanations

* Fix possible-contents.h for `array.new_{data,elem}`

This code was not properly updated in #5214, so GUFA would incorrectly optimize
out `array.new_data` and `array.new_elem` instructions. Fix the problem by
making these instructions data flow roots.

* fix

* move tests

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