[code-reflection] Integrated: Added Clion CMakefile to backends reformated cpp/h files

[Gary Frost]

Added Clion style CMakeLists.txt to backends. 
Reformatted native code *.cpp + *.h for all backends using Clion
Cleaned up opencl_backend

-------------

Commit messages:
 - Added Clion CMakefile to backends reformated cpp/h files

Changes: https://git.openjdk.org/babylon/pull/84/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=84&range=00
  Stats: 1867 lines in 27 files changed: 350 ins; 316 del; 1201 mod
  Patch: https://git.openjdk.org/babylon/pull/84.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/84/head:pull/84

PR: https://git.openjdk.org/babylon/pull/84