pgsql: Rename VariableCacheData.nextFullXid to nextXid.

Rename VariableCacheData.nextFullXid to nextXid.

Including Full in variable names duplicates the type information and
leads to overly long names. As FullTransactionId cannot accidentally
be casted to TransactionId that does not seem necessary.

Author: Andres Freund
Discussion: https://postgr.es/m/20200724011143.jccsyvsvymuiqfxu@alap3.anarazel.de

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/fea10a64340e529805609126740a540c8f9daab4

Modified Files
--------------
src/backend/access/gist/gistxlog.c      |  6 ++---
src/backend/access/rmgrdesc/xlogdesc.c  |  4 +--
src/backend/access/transam/clog.c       |  8 +++---
src/backend/access/transam/commit_ts.c  |  4 +--
src/backend/access/transam/multixact.c  |  2 +-
src/backend/access/transam/subtrans.c   | 10 +++----
src/backend/access/transam/twophase.c   | 22 +++++++--------
src/backend/access/transam/varsup.c     | 26 +++++++++---------
src/backend/access/transam/xact.c       |  4 +--
src/backend/access/transam/xlog.c       | 48 ++++++++++++++++-----------------
src/backend/access/transam/xlogreader.c |  4 +--
src/backend/storage/ipc/procarray.c     | 14 +++++-----
src/backend/storage/ipc/standby.c       |  2 +-
src/backend/storage/lmgr/predicate.c    |  2 +-
src/backend/utils/misc/pg_controldata.c |  4 +--
src/bin/pg_controldata/pg_controldata.c |  4 +--
src/bin/pg_resetwal/pg_resetwal.c       | 18 ++++++-------
src/include/access/transam.h            |  4 +--
src/include/catalog/pg_control.h        |  2 +-
src/include/storage/standby.h           |  2 +-
src/include/storage/standbydefs.h       |  2 +-
21 files changed, 96 insertions(+), 96 deletions(-)