[PATCH] Convert some signatures of SelectionDAG::getNode() to use ArrayRef instead of Ops/NumOps

[Craig Topper]

Several of the signatures of getNode take an SDValue* and a NumOps
argument. This results in most callers having to explicitly call .size() or
hardcoding the size of a statically sized array. This patch converts the
methods to take an ArrayRef so this will now happen automatically. I
explicitly created ArrayRefs for the cases where this wouldn't work or
wasn't obvious to me that it would.

Submitting to the list before I commit since this touches a many files and
locations within them and I've already had to merge a couple times.

-- 
~Craig
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