[PATCH] [InstCombine] Add new rule for MIN(MAX(~A, ~B), ~C) et. al.

[Sanjoy Das]

Hi majnemer,

Optimizing these well are especially interesting for IRCE since it
"clamps" values by generating this sort of pattern through SCEV
expressions.

Depends on D9352.

http://reviews.llvm.org/D9353

Files:
  lib/Transforms/InstCombine/InstCombineSelect.cpp
  test/Transforms/InstCombine/max-of-nots.ll

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