RFR: 8343531: Improve print_location for invalid heap pointers

[Albert Mingkun Yang]

On Mon, 4 Nov 2024 11:01:21 GMT, Volker Simonis <simonis at openjdk.org> wrote:

> but I think it is not trivial.

I was thinking copying the Serial impl into `ParallelScavengeHeap::block_start`; nothing sophisticated.

I suspect the following oddly looking code is used to workaround the unimplemented branch of block_start.


    if (DebuggingContext::is_enabled() || VMError::is_error_reported()) {
      return nullptr;
    }

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PR Comment: https://git.openjdk.org/jdk/pull/21870#issuecomment-2454455414