Suppress a gcc warning related to -O3 -g

[KineticTheory]

Background

• We recently added -g to all builds. We have some source code that generates warnings for -g -O3 related code complexity that we want to silence.

Description of changes

• Add option -fno-var-tracking-assignments for Release GNU builds.

Status

• Reference:
  • Pre-Merge Code Review
  • CDash Status
• Checks
  • Travis/Appveyor CI checks pass
  • Code coverage does not decrease
  • Valgrind test passes
  • Toss3 checks pass
  • Trinitite checks pass
  • Code reviewed/approved, sufficient DbC checks, testing, documentation

[codecov]

Codecov Report

Merging #1075 (7935297) into develop (f004039) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           develop   #1075   +/-   ##
=======================================
  Coverage     88.6%   88.6%           
=======================================
  Files          374     374           
  Lines        18577   18577           
=======================================
  Hits         16477   16477           
  Misses        2100    2100