tests: Adjust conformance tests to account for array invariant #1289
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These were written before compiler optimizations and array invariant. It is now impossible for t[1] to be stored in the hash part, as this would violate the array invariant that says that elements 1..#t are stored in the array.
For ipairs, it doesn't traverse the hash part anymore now, so we adjust the code to make sure no elements outside of the 1..#t slice are covered. For table.find, we can use find-with-offset to still access the hash part.
Fixes #1283.