Fix potential corruption of lock table in CREATE/DROP INDEX CONCURRENTLY.

If VirtualXactLock() has to wait for a transaction that holds its VXID lock
as a fast-path lock, it must first convert the fast-path lock to a regular
lock.  It failed to take the required "partition" lock on the main
shared-memory lock table while doing so.  This is the direct cause of the
assert failure in GetLockStatusData() recently observed in the buildfarm,
but more worryingly it could result in arbitrary corruption of the shared
lock table if some other process were concurrently engaged in modifying the
same partition of the lock table.  Fortunately, VirtualXactLock() is only
used by CREATE INDEX CONCURRENTLY and DROP INDEX CONCURRENTLY, so the
opportunities for failure are fewer than they might have been.

In passing, improve some comments and be a bit more consistent about
order of operations.
Allow parallel copy/link in pg_upgrade

This patch implements parallel copying/linking of files by tablespace
using the --jobs option in pg_upgrade.
Don't attempt to write recovery.conf when -R is not specified

Fixes segmentation fault during regular use.

Fujii Masao
Properly install ecpg_compat and pgtypes libraries on msvc

JiangGuiqing
Merge branch 'master' into matview