[mi] -stack-list-arguments --simple-values

[Vladimir Prus]

This patch makes -stack-list-arguments --simple-values work.
It looks like --simple-values (and friends) were accepted for
-stack-list-locals, but not for -stack-list-arguments. While
the utility of such human friendly spelling is unclear, for
a machine interface, it's even more confusing having 1/2
of relevant commands accept it.

- Volodya

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