RFR: 8283710: JVMTI: Use BitSet for object marking [v5]

[Thomas Stuefe]

On Thu, 7 Apr 2022 17:22:12 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Roman Kennke has updated the pull request incrementally with four additional commits since the last revision:
>> 
>>  - Add comment describing ObjectBitSet
>>  - Refactor JVMTI usage of ObjectBitSet
>>  - Typedef ObjectBitSet<mtTracing> to JFRBitSet in JFR code
>>  - Rename BitSet to ObjectBitSet
>
> src/hotspot/share/jfr/leakprofiler/chains/bfsClosure.hpp line 37:
> 
>> 35: class ObjectBitSet;
>> 36: 
>> 37: typedef ObjectBitSet<mtTracing> JFRBitSet;
> 
> Can you include memory/allocation.hpp for the MEMFLAGS? iterator.hpp already does, but better to be include-clean

Optional: move this typedef to an own jfr/leakprofiler/utilities/jfrbitset.hpp and include that one instead of objectbitset.inline.hpp in the callee cpp files

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PR: https://git.openjdk.java.net/jdk/pull/7964