RFR: JDK-8323839: Expand use of Messager convenience methods in langtools regression tests

[Jonathan Gibbons]

On Tue, 16 Jan 2024 21:53:27 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Simple refactoring. Remaining uses of "printMessage" are against Trees (where there are no corresponding convenience methods) or for calls to printMessage where there is not an appropriate convenience method overload, etc.

Marked as reviewed by jjg (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/17454#pullrequestreview-1825333755