pgsql: Restructure the pg_upgrade code to use several global structures

Restructure the pg_upgrade code to use several global structures rather
than packing everything into 'ctx' and passing that to every function.

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=e13f7e9a711c9117e438516537066bbe61df6455

Modified Files
--------------
contrib/pg_upgrade/check.c | 299 +++++++++++++++++-----------------
contrib/pg_upgrade/controldata.c | 182 ++++++++++----------
contrib/pg_upgrade/dump.c | 28 ++--
contrib/pg_upgrade/exec.c | 62 ++++----
contrib/pg_upgrade/file.c | 22 ++--
contrib/pg_upgrade/function.c | 94 ++++++------
contrib/pg_upgrade/info.c | 116 +++++++-------
contrib/pg_upgrade/option.c | 141 ++++++++--------
contrib/pg_upgrade/page.c | 26 ++--
contrib/pg_upgrade/pg_upgrade.c | 287 ++++++++++++++++----------------
contrib/pg_upgrade/pg_upgrade.h | 177 +++++++++++----------
contrib/pg_upgrade/relfilenode.c | 84 +++++-----
contrib/pg_upgrade/server.c | 114 ++++++-------
contrib/pg_upgrade/tablespace.c | 53 +++---
contrib/pg_upgrade/util.c | 76 +++++----
contrib/pg_upgrade/version.c | 25 ++--
contrib/pg_upgrade/version_old_8_3.c | 166 +++++++++----------
17 files changed, 976 insertions(+), 976 deletions(-)