[scudo] Add new fast purge option. (#175266) This adds a new option to do a faster of a purge. When doing a release to OS due to a purge call, if another thread is also doing a release, the call can be blocked while that operation concludes. In some cases, code wants a fast version that releases as fast as possible and the call will not block. For example, on Android, when destroying a Bitmap a purge occurs to save memory. But this can cause some jank if the purge takes too long. In the future, I envision that this option will also do a calculation to stop purging after some cutoff value to avoid being blocked in this call for too long.
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