RFR: JDK-8314752: Use google test string comparison macros

[Thomas Stuefe]

On Sun, 20 Aug 2023 10:09:49 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Small improvement to use google test's string comparison macros instead of raw C-functions.
> 
> This makes the code more readable and provides us with automatic error output in case of string mismatches (so we don't have to print the values via "<<").

Thanks Coleen and Kim!

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PR Comment: https://git.openjdk.org/jdk/pull/15355#issuecomment-1689293550