pgsql: Rename LVRelState->frozen_pages

Rename LVRelState->frozen_pages

Rename frozen_pages to new_frozen_tuple_pages in LVRelState, the struct
used for tracking state during vacuuming of a heap relation.
frozen_pages sounds like it tracks pages set all-frozen. That is a
misnomer. It only includes pages with at least one newly frozen tuple.
It also includes pages that are not all-frozen.

Author: Melanie Plageman
Reviewed-by: Andres Freund, Masahiko Sawada, Nitin Jadhav, Bilal Yavuz

Discussion: https://postgr.es/m/ctdjzroezaxmiyah3gwbwm67defsrwj2b5fpfs4ku6msfpxeia%40mwjyqlhwr2wu

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/f020baa0662c73aa7e470b1e3856281199ce1ee4

Modified Files
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src/backend/access/heap/vacuumlazy.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)