RFR: 8334164: The fix for JDK-8322811 should use _filename.is_set() rather than strcmp()

[Chris Plummer]

On Thu, 13 Jun 2024 16:55:15 GMT, Sonia Zaldana Calles <szaldana at openjdk.org> wrote:

> Hi all, 
> 
> This PR addresses [8334164](https://bugs.openjdk.org/browse/JDK-8334164). 
> 
> Testing: 
> - [x] Verified specifying the literal `vm_memory_map_<pid>.txt` as the map name does not replace `<pid>`. 
> - [x] Verified `<pid>` is still appropriately replaced if a file path is not specified. 
> 
> Thanks, 
> Sonia

Marked as reviewed by cjplummer (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/19706#pullrequestreview-2123453659