RFR: 8298725: Add BitMap support for reverse iteration

[Thomas Schatzl]

On Wed, 22 Mar 2023 22:51:05 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this addition of BitMap::reverse_iterate, which is like
> BitMap::iterate but visits the set bits in a range from high index to low.
> 
> Testing:
> mach5 tier1, which includes running the updated gtests on all Oracle-supported
> platform

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13151#pullrequestreview-1356253388