[code-reflection] Integrated: All OpWrappers now removed.

[Gary Frost]

This is the final step of removing OpWrappers we now basically use the raw babylon code model ops. 

Lots of changes in this commit/PR.  Including lots of deletions in this one.

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Commit messages:
 - all OpWrappers removed
 - cleaned all imports - ready to delete OpWrappers
 - removed OpWrapper.wrap and all seems ok
 - switched most of c99 code gen to non wrapped ops
 - Simplifying rootset capture
 - Moved rootset helper into OpTk

Changes: https://git.openjdk.org/babylon/pull/541/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=541&range=00
  Stats: 2423 lines in 63 files changed: 162 ins; 1818 del; 443 mod
  Patch: https://git.openjdk.org/babylon/pull/541.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/541/head:pull/541

PR: https://git.openjdk.org/babylon/pull/541