Remove ia32_am_ternary. The only users were Div an IDiv, which are perfectly fine...

Remove ia32_am_ternary.  The only users were Div an IDiv, which are perfectly fine with being declared unary.  Further the only place, where the value was tested (in turn_back_am()) set the wrong operand then.  Though, effectively this was unreachable code, because Div/IDiv generate no sensible flags.

[r22456]