[code-reflection] Integrated: Fixed the class heiarchy of codegen builders

[Gary Frost]

Fixed the class hierachy for C99 code builders. 

Moved  non C99 genaration out from common CodeBuilders.

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Commit messages:
 - Fixed the class heiarchy of codegen builders

Changes: https://git.openjdk.org/babylon/pull/731/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=731&range=00
  Stats: 3105 lines in 25 files changed: 1476 ins; 1484 del; 145 mod
  Patch: https://git.openjdk.org/babylon/pull/731.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/731/head:pull/731

PR: https://git.openjdk.org/babylon/pull/731