Java: Fix range analysis bug where int was assumed.

java/ql/test/query-tests/UselessComparisonTest/C.java

@@ -3,4 +3,12 @@ public class C {
     return (x < 0 || x > 1 || Double.isNaN(x)) ? Double.NaN :
         x == 0 ? 0 : x == 1 ? 1 : 0.5;
   }
+
+  void m2(double x) {
+    if (x > 0) {
+      double y = 1 - x;
+      if (y > 0) { // OK
+      }
+    }
+  }
 }