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.
This fixes an issue were some LibDebug objects (for example,
Dwarf::CompilationUnit) held a reference to their parent
Dwarf::DwarfInfo object, which was constructed on the stack and later
moved to the heap.
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
