The arg1 logging handler changed in compiler-rt to start writing a
different type for entries encountered when logging the first argument
of XRay-instrumented functions. This change allows the trace loader to
support reading these record types as well as prepare for when the
basic (naive) mode implementation starts writing down the argument
Without this change, binaries with arg1 logging support enabled start
writing unreadable logs for any of the XRay tracing tools.