Remove duplicated code; NFC

ICmpInst::makeConstantRange does exactly the same thing as
ConstantRange::makeExactICmpRegion.

llvm-svn: 283059
diff --git a/llvm/lib/Analysis/LazyValueInfo.cpp b/llvm/lib/Analysis/LazyValueInfo.cpp
index 9883154..880adac 100644
--- a/llvm/lib/Analysis/LazyValueInfo.cpp
+++ b/llvm/lib/Analysis/LazyValueInfo.cpp
@@ -1707,8 +1707,8 @@
     }
 
     // Handle more complex predicates.
-    ConstantRange TrueValues =
-        ICmpInst::makeConstantRange((ICmpInst::Predicate)Pred, CI->getValue());
+    ConstantRange TrueValues = ConstantRange::makeExactICmpRegion(
+        (ICmpInst::Predicate)Pred, CI->getValue());
     if (TrueValues.contains(CR))
       return LazyValueInfo::True;
     if (TrueValues.inverse().contains(CR))