PE/ELF binaries are sometimes mapped multiple times in the same process.
If this happens, there is no longer a unique base virtual address per file.
This breaks assumptions required for code caching: Any time a file mapping
is created, FEX must be able to unambiguously determine the base virtual
address of the mapped library.
This becomes possible by creating a separate MappedResource each time an
ELF header is re-mapped.
Tony Wasserka
cf6c0765fa