RFR: 8264682: MemProfiling does not own Heap_lock when using G1

[Coleen Phillimore]

On Tue, 6 Apr 2021 02:04:57 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Trivial fix for JDK-8264682.
>> 
>> `Universe::heap()->used()` calls G1Allocator::used_in_alloc_regions() when G1 enabled,  it checks whether Heap_lock was owned on this thread's behalf.
>
> Sorry but I have to agree with Kim that this is the wrong fix for this problem.
> 
> And the test needs adjusting.
> 
> Thanks,
> David

Unless we can imagine a reason why this code is needed, I think the old memprofiler should be removed.

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PR: https://git.openjdk.java.net/jdk/pull/3340