8162504: TestInstanceKlassSize.java and TestInstanceKlassSizeForInterface.java fail on Mac OS Summary: Modify TestInstanceKlassSizeForInterface.java to avoid the error prone mechanism of spawning a process and attaching back to the current process. Use LingeredApp instead. Reviewed-by: dsamersoff, sspitsyn Contributed-by: jini.george@oracle.com

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