[code-reflection] Integrated: Convey dirty java buffer status to native code

[Gary Frost]

Added java dirty flags to arg sled. Now the backend could choose to only txfer buffer if dirty.

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Commit messages:
 - Convey dirty java buffer status to native code

Changes: https://git.openjdk.org/babylon/pull/202/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=202&range=00
  Stats: 52 lines in 5 files changed: 40 ins; 1 del; 11 mod
  Patch: https://git.openjdk.org/babylon/pull/202.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/202/head:pull/202

PR: https://git.openjdk.org/babylon/pull/202