…k-Simulacrum

Update the dlmalloc submodule

A bug was recently fixed in dlmalloc which meant that released memory to the
system accidentally wasn't getting reused, causing programs to be far slower
than they should be!

Rollup of 12 pull requests

- Successful merges: #47835, #47854, #48015, #48047, #48051, #48058, #48064, #47790, #48059, #48078, #48080, #48085
- Failed merges:

…k-Simulacrum

Update the dlmalloc submodule

A bug was recently fixed in dlmalloc which meant that released memory to the
system accidentally wasn't getting reused, causing programs to be far slower
than they should be!

Rollup of 17 pull requests

- Successful merges: #47790, #47835, #47854, #48015, #48047, #48051, #48058, #48059, #48064, #48078, #48080, #48085, #48086, #48090, #48093, #48098, #48101
- Failed merges:

…k-Simulacrum

Update the dlmalloc submodule

A bug was recently fixed in dlmalloc which meant that released memory to the
system accidentally wasn't getting reused, causing programs to be far slower
than they should be!

Rollup of 20 pull requests

- Successful merges: #47790, #47835, #47854, #48015, #48047, #48051, #48058, #48059, #48064, #48078, #48080, #48086, #48098, #48101, #48107, #48100, #48085, #48120, #48124, #47547
- Failed merges: