[scudo] Tuning changes based on feedback from current use
This tunes several of the default parameters used within the allocator:
- disable the deallocation type mismatch on Android by default; this was causing too many issues with third party libraries;
- change the default SizeClassMap to Dense, it caches less entries and is way more memory efficient overall;
- relax the timing of the RSS checks, 10 times per second was too much, lower it to 4 times (every 250ms), and update the test so that it passes with the new default.
Reviewed By: eugenis
Subscribers: srhines, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D57116