keep base for string parsing in int constructor

Author: lukasstadler

graalpython/com.oracle.graal.python.test/src/tests/test_int.py

@@ -312,3 +312,6 @@ def __int__(self):
 
     assert int(SpecInt1()) == 1
     assert int(SpecInt0()) == 0
+
+def test_create_int_from_string():
+  assert int("5c7920a80f5261a2e5322163c79b71a25a41f414", 16) == 527928385865769069253929759180846776123316630548

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/BuiltinConstructors.java

@@ -785,7 +785,7 @@ public abstract static class IntNode extends PythonBuiltinNode {
         private Object stringToInt(String num, int base) {
             String s = num.replace("_", "");
             if ((base >= 2 && base <= 32) || base == 0) {
-                BigInteger bi = asciiToBigInteger(s, 10, false);
+                BigInteger bi = asciiToBigInteger(s, base, false);
                 if (bi.compareTo(BigInteger.valueOf(Integer.MAX_VALUE)) > 0 || bi.compareTo(BigInteger.valueOf(Integer.MIN_VALUE)) < 0) {
                     return bi;
                 } else {