RFR: 8246258: Enable hs_err heap printing earlier during initialization

[stefan.johansson at oracle.com]

Hi Stefan,

On 2020-06-01 17:55, Stefan Karlsson wrote:
> Hi all,
> 
> Please review this patch to enable the hs_err GC / heap printing 
> directly after the heap has been set up.
> 
> https://cr.openjdk.java.net/~stefank/8246258/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8246258
Looks good,
StefanJ

> 
> Changes in the patch:
> - Remove the Universe::is_fully_initialized
> - Add NULL initializations and checks in print paths
> 
> I tested this patch by adding a temporary fatal(...) here:
> 
> jint Universe::initialize_heap() {
>    assert(_collectedHeap == NULL, "Heap already created");
>    _collectedHeap = GCConfig::arguments()->create_heap();
>    // <<<< HERE
>    log_info(gc)("Using %s", _collectedHeap->name());
>    return _collectedHeap->initialize();
> }
> 
> and manually looking at the result when running with all GCs. Will run 
> this through tier1-3.
> 
> Thanks,
> StefanK