[Chapel Merge] Increase the problem size for the multi-locale sca

Branch: refs/heads/master
Revision: 5f95c6d
Author: ronawho
Log Message:

Merge pull request #16918 from ronawho/increase-ml-scan-problem-size

Increase the problem size for the multi-locale scan performance test

The old problem size was set when distributed scan was serial and slow,
but it was significantly optimized a while back in #12481. The current
problem size finishes in ~0.01 seconds, which isn’t that telling.
Increase the problem size to 1/4 of memory, which is what we use for the
single locale problem size.

Modified Files:
M test/scan/scanPerf.ml-execopts

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