[Patch] Intrinsic Lowering

[Andreas Rechberger]

I have played a little bit with the lli interpreter - realising that not 
all of the intrinsic functions have been implemented.
Digging a bit deeper I have prepared a small patch to extend the 
intrinsinc lowering capability.
As of now only llvm.umul.with.overflow is added - in order to verify if 
I have got the point ... comments welcome.

If this is accepted I would appreciate this to be commited to the 
repository (I do not have commit access).

The second change is more a question ...
Is there a reason for the interpreter to omit the new line after its 
"About to interpret: " debug message ?
In my opinion the output arrangement is better with adding line breaks 
after every instruction - rather than printing them endlessly.

/Andreas

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