What is the difference between Inlining vs Heap Flattening?

[David Alayachew]

Hello Valhalla Dev Team,

(Resending since the first attempt didn't seem to go through)

I saw the most recent update to JEP 401, and I just wanted to understand
what the difference is between Inlining and Heap Flattening. I have a
nebulous understanding of both, and I think Heap Flattening is better than
inlining, but I don't know if they are concepts that overlap, or are
entirely orthogonal to each other. Google wasn't much help.

Thank you for your help!
David Alayachew
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