RFR: 8282240: Add _name field to Method for NOT_PRODUCT only [v3]

[Coleen Phillimore]

On Fri, 25 Feb 2022 20:19:26 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Whenever I'm debugging I really wish I knew the name of the method that I'm looking at, so I added this field in not-product.
>> Tested with tier1 on Oracle platforms.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Set _name field in constructor with available symbol rather than later when constant pool pointer is set.  I like this one better.

Thanks Patricio and Harold.  With this fix (needed to walk new field for CDS), the new test passes on all platforms.

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PR: https://git.openjdk.java.net/jdk/pull/7608