Address possible lossy conversion warning in `ProgrammableInvoker`. Testing: `run-test-jdk_foreign`, testing with patch from https://github.com/openjdk/jdk/pull/8599 to see if the warning is gone.
------------- Commit messages: - Address possible lossy conversion warning in ProgrammableInvoker Changes: https://git.openjdk.java.net/jdk/pull/8697/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8697&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8286390 Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod Patch: https://git.openjdk.java.net/jdk/pull/8697.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/8697/head:pull/8697 PR: https://git.openjdk.java.net/jdk/pull/8697
