Refactor lazy_scan_prune() VM clear logic into helper

Encapsulating the cases that clear the visibility map after vacuum phase
I, when corruption is detected, into in a helper makes the code cleaner
and enables further refactoring in future commits.

Author: Melanie Plageman <[email protected]>
Reviewed-by: Andres Freund <[email protected]>
Reviewed-by: Kirill Reshke <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Reviewed-by: Andrey Borodin <[email protected]>
Discussion: 
https://postgr.es/m/7ib3sa55sapwjlaz4sijbiq7iezna27kjvvvar4dpgkmadml6t%40gfpkkwmdnepx

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/19af794b660e3711d8b698aeedfc33e13dc235d8

Modified Files
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src/backend/access/heap/vacuumlazy.c | 131 ++++++++++++++++++++++-------------
1 file changed, 83 insertions(+), 48 deletions(-)

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