[MetaModelica] skip cases for partial matches

[hkiel]

There are many match expressions with multiple arguments in OMCompiler.

Take ExpressionSimplify.simplifyBinary2() as an example: the second argument is the operator of a binary expression. There are many cases with DAE.ADD, DAE.SUB, DAE.MUL, DAE.DIV, etc. cluttered in the cases. If this first expression matches, the match-iterator could be advanced to the next case that matches this part as well.

[hkiel]

I guess a partial match on the first argument only would even be better (given that some match arguments are re-ordered) than the full match.