[PATCH] [ConstantRange] Teach multiply to be cleverer about signed ranges.

[Sanjoy Das]

Small nit inline.  I think this looks okay, but I don't know this part of LLVM to LGTM this.


REPOSITORY
  rL LLVM

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Comment at: lib/IR/ConstantRange.cpp:609
@@ +608,3 @@
+  // lower and upper ranges; for example:
+  //   [-1,4) * [-2,3) = min(-1*-2, -1*3, 4*-2, 4*3) = -8.
+  // Similarly for the upper bound, swapping min for max.
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This example is a bit off, the min should be `min(-1*-2, -1*2, 3*-2, 3*2)` = `-6`.  The code is correct, as far as I can tell.

http://reviews.llvm.org/D7789

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