RFR: 8292914: Drop the counter from lambda class names

[David M. Lloyd]

The class generated for lambda proxies is now defined as a hidden class. This means that the counter, which was used to ensure a unique class name and avoid clashes, is now redundant. In addition to performing redundant work, this also impacts build reproducibility for native image generators which might already have a strategy to cope with hidden classes but cannot cope with indeterminate definition order for lambda proxy classes.

This solves JDK-8292914 by making lambda proxy names always be stable without any configuration needed. This would also replace #10024.

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Commit messages:
 - 8292914: Drop the counter from lambda class names

Changes: https://git.openjdk.org/jdk/pull/12579/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12579&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292914
  Stats: 4 lines in 1 file changed: 0 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12579.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12579/head:pull/12579

PR: https://git.openjdk.org/jdk/pull/12579