[WIP] Move drop elaboration before borrowck#107732

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zeegomo wants to merge 4 commits intorust-lang:masterfrom zeegomo:move-drop-elab

+295-120

Commits on Feb 8, 2023

POC: Move drop elaboration before borrowck
zeegomo
committed

Commits on Feb 23, 2023

Only remove unreachable blocks
zeegomo
committed

Commits on Feb 24, 2023

Ignore drop-elab discriminant reads
zeegomo
committed

Commits on Feb 25, 2023

Ignore box free more selectively
zeegomo
committed