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LibCoreDump: Change Backtrace debug info cache to member variable
This changes the previously static s_debug_info_cache to a member variable. This is required so the cache is not kept alive if the Backtrace object is destroyed. Previously, the cache object would keep alive MappedFile objects and other data, resulting in CrashReporter and CrashDaemon using more than 100 MB of memory even after the Backtrace objects have been destroyed (and the data is thus no longer needed). This was especially the case when handling crashes from Browser (due to libweb.so and libjs.so). Due to this change, object_info_for_region has been promoted to a instance method. It has also been cleaned up somewhat.
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