abs() should coerce to int

Author: timfel

graalpython/com.oracle.graal.python.test/src/tests/unittest_tags/test_bool.txt

@@ -14,6 +14,7 @@
 *BoolTest.test_issubclass
 *BoolTest.test_keyword_args
 *BoolTest.test_marshal
+*BoolTest.test_math
 *BoolTest.test_operator
 *BoolTest.test_pickle
 *BoolTest.test_picklevalues

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

@@ -219,8 +219,8 @@ public void postInitialize(PythonCore core) {
     @GenerateNodeFactory
     public abstract static class AbsNode extends PythonUnaryBuiltinNode {
         @Specialization
-        public boolean absInt(boolean arg) {
-            return arg;
+        public int absInt(boolean arg) {
+            return arg ? 1 : 0;
         }
 
         @Specialization