SystemSan: more logs for arbitrary file open (#8432)
SystemSan: more logs for arbitrary file open (#8432)

cc @oliverchang 

Log the file trying to be opened and the flags (read or write) for
opening the file

Co-authored-by: Oliver Chang <4872e2f9221282fc7b04cbd9bb5a261e7186a504@users.noreply.github.com>
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