debuginfo: Fix regression in for-loop variable debuginfo #20027
Merged
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Back when for-loop iteration variables were just de-sugared into
let
bindings, debuginfo for them was created like for any otherlet
binding. When the implementation approach for for-loops changed, we ceased having debuginfo for the iteration variable. This PR fixes this omission and adds a more prominent test case for it.Also contains some minor, general cleanup of the debuginfo module.
Fixes #19732