[LLVMdev] Folding an insertelt chain

[Ivan Llopard]

Hello,

I've added a little combining operation in DAGCombiner to fold a chain 
of insertelt nodes if that chain is proved to fully overwrite the very 
first source vector. In which case, I supposed a build_vector is better. 
It seems to be safe but I don't know if it is correctly implemented or 
if it is already done somewhere else. Please find attached the patch.

Regards,
Ivan
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