Fix Reg Test Speed

[hgopalan]

Changes in input type to speed-up reg test. Tested in debug mode.

old:

nrel_precursor

Time spent in InitData(): 565.0228059
Time spent in Evolve(): 972.1358745

nrel_terrain

Time spent in InitData(): 7.103995917
Time spent in Evolve(): 887.4731385

nrel_terrain_amr

Time spent in InitData(): 7.652189625
Time spent in Evolve(): 1327.320866

new:

nrel_precursor

Time spent in InitData(): 49.61729417
Time spent in Evolve(): 113.3794835

nrel_terrain

Time spent in InitData(): 2.131946458
Time spent in Evolve(): 80.65912675

nrel_terrain_amr

Time spent in InitData(): 2.192530083
Time spent in Evolve(): 151.0545329

Please check the type of change introduced:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• [ X] Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Checklist

The following is included:

• new unit-test(s)
• new regression test(s)
• documentation for new capability

This PR was tested by running:

• the unit tests
  • on GPU
  • on CPU
• the regression tests
  • on GPU
  • [ X] on CPU

[marchdf]

Thanks!