[SharedCache] Track whether non-image regions are data vs code

`BackingCache` now tracks the `dyld_cache_mapping_info` for its mappings
so it has access to the memory protections for the region. This means it
can avoid marking some regions as containing code when they don't,
reducing the amount of analysis work that has to be done.

Using `dyld_cache_mapping_info` also makes references to mappings easier
to understand due to its named fields vs the nested `std::pair`s that
were previously in use.

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