RFR: 8261161: Clean up warnings in hotspot/jtreg/vmTestbase tests

[Harold Seigel]

On Fri, 5 Feb 2021 16:53:00 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Please review this change to clean up warnings, such as the following, in the vmTestbase tests.  
>> 
>> warning: [synchronization] attempt to synchronize on an instance of a value-based class 
>> warning: [removal] Integer(int) in Integer has been deprecated and marked for removal
>> 
>> This change cleans up the warnings by using a non-value based class to synchronize on, and replacing calls such as Integer(int) with Integer.valueOf(int).
>> 
>> The change was tested by running Mach5 tiers 1-2 on Linux, Mac OS, and Windows, and Mach5 tiers 3-8 on Linux x64.
>> 
>> Thanks, Harold
>
> Wow. thank you!

Thanks Lois and Coleen for the reviews!

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PR: https://git.openjdk.java.net/jdk/pull/2427