RFR: 8288651: CDS test HelloUnload.java should not use literal string as ClassLoader name

[Calvin Cheung]

On Mon, 27 Jun 2022 17:32:24 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

> A simple test fix for changing the class loader name to a non-literal string so that the symbol refcount could be decremented upon unloading of the class loader.
> 
> Passed tiers 1 and 2 testing. Inspected the .jtr file to check the symbol refcount was decremented.

Thanks Coleen, Ioi for the review.

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PR: https://git.openjdk.org/jdk/pull/9297