RFR: JDK-8273914: Indy string concat changes order of operations

[Aleksey Shipilev]

On Wed, 6 Oct 2021 21:00:04 GMT, Liam Miller-Cushon <cushon at openjdk.org> wrote:

> This change makes string concatenation call `toString` on the arguments eagerly, to preserve the correct evaluation order of the arguments and the calls to `toString`.

Thank you for fixing this. It looks nominally fine, but I would defer to javac experts to approve this. Minor testing suggestions below.

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PR: https://git.openjdk.java.net/jdk/pull/5844