[jdk11u-dev] RFR: 8232933: Javac inferred type does not conform to equality constraint

[Andrew Lu]

I backport this for parity with 11.0.22-oracle.

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Commit messages:
 - Backport 7a85441a85b2472215ca7bc66e636dff06d9ebf3

Changes: https://git.openjdk.org/jdk11u-dev/pull/2170/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2170&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/jdk11u-dev/pull/2170.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2170/head:pull/2170

PR: https://git.openjdk.org/jdk11u-dev/pull/2170