[code-reflection] RFR: Replace opField with opMethod for lambdas. [v4]

[Mourad Abbay]

> We replace field holding the textual representation of an identified lambda with method that returns the representation of that lambda.

Mourad Abbay has updated the pull request incrementally with one additional commit since the last revision:

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  Co-authored-by: Paul Sandoz <paul.d.sandoz at googlemail.com>

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Changes:
  - all: https://git.openjdk.org/babylon/pull/301/files
  - new: https://git.openjdk.org/babylon/pull/301/files/0378f828..cc4147f3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=301&range=03
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=301&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/babylon/pull/301.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/301/head:pull/301

PR: https://git.openjdk.org/babylon/pull/301