[jdk17] RFR: 8270184: [TESTBUG] Add coverage for jvmci ResolvedJavaType.toJavaName() for lambdas

[Severin Gehwolf]

Clean backport. Test-only change. Test passes.

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Commit messages:
 - Backport 6a9bc108736522897f03a75c83e90e2c2a183d27

Changes: https://git.openjdk.java.net/jdk17/pull/246/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17&pr=246&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270184
  Stats: 13 lines in 1 file changed: 13 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/246.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/246/head:pull/246

PR: https://git.openjdk.java.net/jdk17/pull/246