I added some peephole rules for the mcs51 port.
In very short interrupt functions, if ending with an if /
then / else, 2 cycles can be saved (peepholes 262a/b).
Rules can be added for providing the case of more saved
The second set of peepholes (256g/h) removes some
rendundant "clr c".
At the moment i'm thinking about final optimizing after
the asm source is build.
If somebody wants to know, how I want to do that,
please tell me. If it will be finished I will send it as a RFE
together with the solution for the mcs51 port.
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