RFR: 8274265: Suspicious string concatenation in test code

[Ioi Lam]

On Fri, 24 Sep 2021 08:49:16 GMT, Jesper Steen Møller <jespersm at openjdk.org> wrote:

> This patch fixes the mishap, and lets JDK compile under XCode 13 / LLVM 13.

I've updated the RFE title to be more specific. Please update the PR title to match the RFE before integration.

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PR: https://git.openjdk.java.net/jdk/pull/5675