start using the new helper methods a bit.

llvm-svn: 135251
diff --git a/llvm/lib/Transforms/Scalar/Reassociate.cpp b/llvm/lib/Transforms/Scalar/Reassociate.cpp
index c1dfe15..e6341ae 100644
--- a/llvm/lib/Transforms/Scalar/Reassociate.cpp
+++ b/llvm/lib/Transforms/Scalar/Reassociate.cpp
@@ -812,7 +812,7 @@
       // because we can percolate the negate out.  Watch for minint, which
       // cannot be positivified.
       if (ConstantInt *CI = dyn_cast<ConstantInt>(Factor))
-        if (CI->getValue().isNegative() && !CI->getValue().isMinSignedValue()) {
+        if (CI->isNegative() && !CI->isMinValue(true)) {
           Factor = ConstantInt::get(CI->getContext(), -CI->getValue());
           assert(!Duplicates.count(Factor) &&
                  "Shouldn't have two constant factors, missed a canonicalize");