verify_heapam() wasn't being careful to sanity-check tuple line
pointers before using them, resulting in SIGBUS on alignment-picky
architectures. Fix that, add some more test coverage.
Mark Dilger, some tweaking by me
Discussion: https://postgr.es/m/30B8E99A-2D9C-48D4-A55C-741C9D5F1563@enterprisedb.com
The tests added by commit 866e24d47 failed on big-endian machines
due to lack of attention to endianness considerations. Fix that.
While here, improve a few small cosmetic things, such as running
it through perltidy.
Mark Dilger
Discussion: https://postgr.es/m/30B8E99A-2D9C-48D4-A55C-741C9D5F1563@enterprisedb.com