[PATCH] [SCEV] Unify getUnsignedRange and getSignedRange

[Sanjoy Das]

Hi atrick, nlewycky,

Doing this removes some duplicated code, and also helps optimization:
e.g. in the test case added, `%idx ULT 128` in `@x` is not currently
optimized to `true` by `-indvars`.

http://reviews.llvm.org/D8142

Files:
  include/llvm/Analysis/ScalarEvolution.h
  lib/Analysis/ScalarEvolution.cpp
  test/Analysis/ScalarEvolution/range-signedness.ll

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