VisibleMemberMap.java possible performance improvements

[Michael Simacek]

Hi,

I thought about improving performance of the default doclet implementation a bit.
According to profiler results, most of the CPU time is spent in constructing the member map in VisibleMemberMap.java.
So I've rewritten part of the VisbleMemberMap and reduced the javadoc run time to 60-70% of original run time (on large inputs).

Is there any chance of this patch (attached) being accepted into OpenJDK?
I've never made any contribution to OpenJDK before, so I would like to ask for code review and guidance through the contribution process.

Michael

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