llvm dev - Mar 2009 - [LLVMdev] DAGCombiner Patch: Allow targets to do combine first.

The DAGCombiner::combine() in its existing form does not allow targets to do
anything if the visitNODE() has done something with it.
IMO, the targets should always be allowed to do stuff irrespective of what we
want to do in visitNODE().

Attached is a patch for same. Let me know if it sounds ok. I will go ahead and
commit it.

- Sanjiv



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