Fix string formatting of numbers outside int range

Prior to this patch, string '%' formatting would produce incorrect
results on numbers outside the 32-bit integer range. Before formatting
these values the StringFormatter would convert the values down to ints.

To fix this, we can format these values as BigIntegers. This will have
some performance impact, but can be optimized later by introducing a
code path to format primative long values and possibly by conditionally
down-casting BigIntegers to ints or longs when safe to use those
(presumedly faster) code paths.

Author: Zach Olstein

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/runtime/formatting/StringFormatter.java

@@ -15,7 +15,8 @@
 import static com.oracle.graal.python.runtime.exception.PythonErrorType.TypeError;
 import static com.oracle.graal.python.runtime.exception.PythonErrorType.ValueError;
 
-import com.oracle.graal.python.util.BiFunction;
+import java.math.BigInteger;
+import java.util.function.BiFunction;
 
 import com.oracle.graal.python.builtins.PythonBuiltinClassType;
 import com.oracle.graal.python.builtins.objects.PNone;
@@ -393,10 +394,10 @@ public Object format(Object args1, CallNode callNode, BiFunction<Object, String,
                         fi.format((Integer) argAsNumber);
                     } else if (argAsNumber instanceof Long) {
                         f = fi = new IntegerFormatter.Traditional(core, buffer, spec);
-                        fi.format(((Long) argAsNumber).intValue());
+                        fi.format((BigInteger.valueOf((Long) argAsNumber)));
                     } else if (argAsNumber instanceof PInt) {
                         f = fi = new IntegerFormatter.Traditional(core, buffer, spec);
-                        fi.format(((PInt) argAsNumber).intValue());
+                        fi.format(((PInt) argAsNumber).getValue());
                     } else if (arg instanceof String && ((String) arg).length() == 1) {
                         f = ft = new TextFormatter(core, buffer, spec);
                         ft.format((String) arg);