use a more detailed alert message in bitwise-sign-check

Author: erik-krogh

cpp/ql/src/Likely Bugs/Arithmetic/BitwiseSignCheck.ql

@@ -25,4 +25,4 @@ where
   forall(int op | op = lhs.(BitwiseAndExpr).getAnOperand().getValue().toInt() | op < 0) and
   // exception for cases involving macros
   not e.isAffectedByMacro()
-select e, "Sign check of a bitwise operation."
+select e, "Potential unsafe sign check of a bitwise operation."

java/ql/src/Likely Bugs/Comparison/BitwiseSignCheck.ql

@@ -16,4 +16,4 @@ where
   e.isStrict() and
   e.getGreaterOperand() instanceof BitwiseExpr and
   e.getLesserOperand().(IntegerLiteral).getIntValue() = 0
-select e, "Sign check of a bitwise operation."
+select e, "Potential unsafe sign check of a bitwise operation."

javascript/ql/src/Expressions/BitwiseSignCheck.ql

@@ -53,4 +53,4 @@ where
   not e instanceof EqualityTest and
   e.getRightOperand().getIntValue() = 0 and
   not acceptableSignCheck(b)
-select e, "Sign check of a bitwise operation."
+select e, "Potential unsafe sign check of a bitwise operation."