[code-reflection] RFR: conflicting code reflection fields for method overrides

[Adam Sotona]

This patch constructs code reflection fields from method name and $-escaped method parameters.

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Commit messages:
 - conflicting code reflection fields for method overrides

Changes: https://git.openjdk.org/babylon/pull/162/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=162&range=00
  Stats: 44 lines in 4 files changed: 40 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/babylon/pull/162.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/162/head:pull/162

PR: https://git.openjdk.org/babylon/pull/162