RFR: 8310920: Fix -Wconversion warnings in command line flags [v3]

[Coleen Phillimore]

> This is broken out from but tested with the PR from https://github.com/openjdk/jdk/pull/14659

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Take out an f.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/14665/files
  - new: https://git.openjdk.org/jdk/pull/14665/files/95ee731c..41b02544

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14665&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14665&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14665.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14665/head:pull/14665

PR: https://git.openjdk.org/jdk/pull/14665