[PATCH] [SDAG] Add SDNodes for umin, umax, smin and smax

[Elena Demikhovsky]

ComputeValueVTs() is for arrays and structures, not for splitting one value into two.
For arrays, you'll have UMIN for each pair A[i] B[i], instead of "select".
For a structure, you may have a mix of UMIN and "select" since the types may be different.


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  rL LLVM

http://reviews.llvm.org/D9746

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