trap instead of error on 32 TiB table

I was wondering what happens when the 32 TiB per table limit is
reached, so I faked 32767 1 GiB sparse files using dd and then tried
inserting more rows.

On a cassert-enabled build I got:

TRAP: FailedAssertion("tagPtr->blockNum != P_NEW", File: "./build/../src/backend/storage/buffer/buf_table.c", Line: 125)

On a normal build, I got:

ERROR:  cannot extend file "base/18635/53332" beyond 4294967295 blocks
ORT:  mdextend, md.c:443

Shouldn't the cassert build raise the ERROR instead as well?

PostgreSQL 13.4.

Christoph
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