Permit tsim to use memh for input since 04fa380
Permit tsim to use memh for input since 04fa380

The calling convention for format inputs now permits 0 to be a valid
return code (meaning "I didn't produce an instruction on this call, but
input is still valid"). Update tsim to permit memh usage :

    tas -d ex/hello.texe | tas -fmemh - | tsim -fmemh -

kulp/tenyr,kulp/tenyr,kulp/tenyr