osrm-extract using excessive memory from a certain point in the master branch (5.27.0).

[MovieJo]

I am using small data from south-korea (as small as 160M).

This data was smoothly extracted even from devices with 8G memory.

From the master branch at some point, even on a machine with 32GB of memory, I had OOM kills when extracting.

And when I build it again with 5.26.0 version, it is extracted normally.

[handcath]

As flagged up in #6297 .
OS kills osrm-extract process as it runs out of memory.

[SiarheiFedartsou]

Should be fixed by #6304