Nim/tools/nimgrind.supp

{
    markstackandregisters_Cond
    Memcheck:Cond
    ...
    fun:markStackAndRegisters*
    ...
}
{
    markstackandregisters_Value8
    Memcheck:Value8
    ...
    fun:markStackAndRegisters*
    ...
}
{
    unmarkStackAndRegisters_Value8
    Memcheck:Value8
    ...
    fun:unmarkStackAndRegisters_zoTIuavlrCHyw3B8MBaLJA_6
    ...
}