RFR: JDK-8296322 javac: use methods to manage parser mode flags

[Maurizio Cimadamore]

On Fri, 4 Nov 2022 12:33:44 GMT, Jim Laskey <jlaskey at openjdk.org> wrote:

> Manage parser mode flags using methods for easy of reading and maintenance.

Looks good

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Marked as reviewed by mcimadamore (Reviewer).

PR: https://git.openjdk.org/jdk/pull/10981