[code-reflection] Integrated: cuda now also leverages c99 preprocessor

[Gary Frost]

Merged common HATKernelCodeGen.  Now both CUDA and OpenCL lean on the c99 preprocessor.

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

Commit messages:
 - cuda now also leverages c99 preprocessor

Changes: https://git.openjdk.org/babylon/pull/601/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=601&range=00
  Stats: 203 lines in 4 files changed: 75 ins; 99 del; 29 mod
  Patch: https://git.openjdk.org/babylon/pull/601.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/601/head:pull/601

PR: https://git.openjdk.org/babylon/pull/601