[LLVMdev] RFC: Tailcall Improvement

[Arnold Schwaighofer]

Here is a patch to improve argument lowering for tail calls. Before  
this patch all outgoing arguments were move to the stack slot where  
they would go on a normal function call and from there moved back to  
the tail call stack slot to prevent overwriting of values.
After this patch only arguments that source from callers arguments  
(formal_arguments) are lowered this way.

I moved some code that would otherwise be duplicated to a new  
function 'GetMemCpyWithFlags'.

Okay to commit?

regards arnold


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