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`__bolt_instr_data_dump()` will find instrumented binary name by iterating through entries under directory `/proc/self/map_files`, and then open the binary and memory map it onto heap in order to locate `.bolt.instr.tables` section to read the descriptions. If binary name is already known and/or binary is already opened as memory mapped, we can pass binary name and/or memory buffer directly to `__bolt_instr_data_dump()` to save some work.