Matthew Pickering authored Feb 26, 2021 and Marge Bot committed Mar 08, 2021

The BLOCKS_SIZE event reports the size of the currently allocated blocks
in bytes.

It is like the HEAP_SIZE event, but reports about the blocks rather than
megablocks.

You can work out the current heap fragmentation by looking at the
difference between HEAP_SIZE and BLOCKS_SIZE.

Fixes #19357