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ignore arguments that start with +
This causes htif to skip unknown arguments that start with +.
Other arguments that start with - will still issue stderr messages but not stop option parsing.
This is an improvement on current handling where htif will silently treat unknown arguments that start with + as target arguments.
Open to suggestions but this is a strawman for handling https://github.com/freechipsproject/rocket-chip/issues/1194
@seldridge does this make sense with https://github.com/freechipsproject/rocket-chip/pull/1192?
Yes, they should be mutually exclusive as HTIF argument parsing happens after emulator.cc argument parsing. The PlusArg PR (freechipsproject/rocket-chip#1192) effectively only generates your plusarg struct and the help text based on Chisel code. So, if this PR works with rocket-chip master then the freechipsproject/rocket-chip#1192 shouldn't be an incompatible approach.
Famous last words, however, as I keep delaying testing this with VCS (it's a pain for a variety of reasons...) and there are no regressions that bang on these specific plus args...
