Fix data loss at inplace update after heap_update().

As previously-added tests demonstrated, heap_inplace_update() could
instead update an unrelated tuple of the same catalog.  It could lose
the update.  Losing relhasindex=t was a source of index corruption.
Inplace-updating commands like VACUUM will now wait for heap_update()
commands like GRANT TABLE and GRANT DATABASE.  That isn't ideal, but a
long-running GRANT already hurts VACUUM progress more just by keeping an
XID running.  The VACUUM will behave like a DELETE or UPDATE waiting for
the uncommitted change.

For implementation details, start at the systable_inplace_update_begin()
header comment and README.tuplock.  Back-patch to v12 (all supported
versions).  In back branches, retain a deprecated heap_inplace_update(),
for extensions.

Reported by Smolkin Grigory.  Reviewed by Nitin Motiani, (in earlier
versions) Heikki Linnakangas, and (in earlier versions) Alexander
Lakhin.

Discussion: https://postgr.es/m/CAMp+ueZQz3yDk7qg42hk6-9gxniYbp-=bG2mgqecErqR5gGGOA@mail.gmail.com

src/backend/access/heap/README.tuplock

@@ -153,3 +153,14 @@ The following infomask bits are applicable:
 
 We currently never set the HEAP_XMAX_COMMITTED when the HEAP_XMAX_IS_MULTI bit
 is set.
+
+Reading inplace-updated columns
+-------------------------------
+
+Inplace updates create an exception to the rule that tuple data won't change
+under a reader holding a pin.  A reader of a heap_fetch() result tuple may
+witness a torn read.  Current inplace-updated fields are aligned and are no
+wider than four bytes, and current readers don't need consistency across
+fields.  Hence, they get by with just fetching each field once.  XXX such a
+caller may also read a value that has not reached WAL; see
+systable_inplace_update_finish().