Improve test coverage in bump.c

There were no callers of BumpAllocLarge() in the regression tests, so
here we add a sort with a tuple large enough to use that path in bump.c.

Also, BumpStats() wasn't being called, so add a test to sysviews.sql to
call pg_backend_memory_contexts() while a bump context exists in the
backend.

Reported-by: Andres Freund
Discussion: https://postgr.es/m/[email protected]

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