[code-reflection] Integrated: Allow Trxfmr to rename func

[Gary Frost]

Trxfmr can now rename funcs. 

Also fixed a bug in isAssignable when passed primitives.

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Commit messages:
 - Allow Trxfmr to rename func

Changes: https://git.openjdk.org/babylon/pull/813/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=813&range=00
  Stats: 31 lines in 4 files changed: 24 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/babylon/pull/813.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/813/head:pull/813

PR: https://git.openjdk.org/babylon/pull/813