[jdk17u-dev] RFR: 8232933: Javac inferred type does not conform to equality constraint

[Goetz Lindenmaier]

I backport this for parity with 17.0.10-oracle.

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Commit messages:
 - Backport 7a85441a85b2472215ca7bc66e636dff06d9ebf3

Changes: https://git.openjdk.org/jdk17u-dev/pull/1730/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1730&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8232933
  Stats: 60 lines in 2 files changed: 60 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1730.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1730/head:pull/1730

PR: https://git.openjdk.org/jdk17u-dev/pull/1730