Extend Range analysis to 64-bit range and mint operations

runtime/vm/flow_graph_optimizer.cc

Index: runtime/vm/flow_graph_optimizer.cc
diff --git a/runtime/vm/flow_graph_optimizer.cc b/runtime/vm/flow_graph_optimizer.cc
index 8ecbfe2b6673a00d9b17325846ee9d10bf73a3a3..2224f01bf7d183893f134e9d03c591dc1423be32 100644
--- a/runtime/vm/flow_graph_optimizer.cc
+++ b/runtime/vm/flow_graph_optimizer.cc
@@ -4970,9 +4970,9 @@ RangeAnalysis::Direction RangeAnalysis::ToDirection(Value* val) {
                                                           : kNegative;
   } else if (val->definition()->range() != NULL) {
     Range* range = val->definition()->range();
-    if (Range::ConstantMin(range).value() >= 0) {
+    if (Range::ConstantMin(range).ConstantValue() >= 0) {
       return kPositive;
-    } else if (Range::ConstantMax(range).value() <= 0) {
+    } else if (Range::ConstantMax(range).ConstantValue() <= 0) {
       return kNegative;
     }
   }