RFR: JDK-8325189: Enable this-escape javac warning in java.base

[Joe Darcy]

On Fri, 2 Feb 2024 23:38:41 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> In its initial form, the changes are tested on Linux. Later on, I'll do cross-platform builds to make sure there aren't any, say, windows-specific changes that are needed as well.
> 

PS Builds pass on all platforms (linux, mac, and windows) on Oracle's internal build system.

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PR Comment: https://git.openjdk.org/jdk/pull/17692#issuecomment-1925001815