Goodbye register keyword. Compiler knows better.

src/backend/access/common/heaptuple.c

src/backend/access/common/indextuple.c

src/backend/access/common/printtup.c

src/backend/access/heap/heapam.c

src/backend/bootstrap/bootstrap.c

src/backend/catalog/aclchk.c

src/backend/catalog/catalog.c

src/backend/catalog/heap.c

src/backend/catalog/pg_aggregate.c

src/backend/catalog/pg_operator.c

src/backend/catalog/pg_proc.c

src/backend/catalog/pg_type.c

src/backend/commands/remove.c

src/backend/executor/nodeHash.c

src/backend/lib/qsort.c

src/backend/optimizer/util/plancat.c

src/backend/port/dynloader/aix.c

src/backend/port/getrusage.c

src/backend/port/inet_aton.c

src/backend/port/strcasecmp.c