Help CMake differentiate bewteen Clang, IntelLLVM and CCELLVM.

[KineticTheory]

Background

• CMake is confused about LLVM Clang vs. LLVM Intel vs. LLVM CCE. Provide some help.

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[bot]]

Codecov Report

Merging #1138 (eda03e2) into develop (7d6562c) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           develop   #1138   +/-   ##
=======================================
  Coverage     89.0%   89.0%           
=======================================
  Files          374     374           
  Lines        19263   19263           
=======================================
  Hits         17155   17155           
  Misses        2108    2108