Honor Py_UNICODE_ISSPACE when parsing int() from strings

[hippi345]

Summary

int() string parsing in PyLongFromUnicodeObject stripped leading/trailing whitespace with Java Character.isWhitespace. That does not match CPython Py_UNICODE_ISSPACE / str.isspace (for example U+00A0 NO-BREAK SPACE is a Python space but not a Java whitespace character).

This change reuses StringUtils.isSpace, the same helper used by str.isspace, when stripping int() input.

Fixes #1209

Tests

New coverage in test_int.py:

• int("\xa0123") == 123
• int("123\xa0") == 123

Before (unmodified upstream/master, new test only)

========== BEFORE FIX: new test only ==========
WARNING:   graalpython:PYTHON_NATIVE_STANDALONE_SVM_JAVA25:
distribution PYTHON_NATIVE_STANDALONE_SVM_JAVA25 redefined
Running: MX_GRAALPYTEST=1 PYTHONHASHSEED=0 /workspace/mxbuild/linux-amd64/GRAALPY_JVM_STANDALONE/bin/graalpy --vm.ea --python.WithJavaStacktrace=1 --experimental-options=true --python.EnableDebuggingBuiltins /workspace/graalpython/com.oracle.graal.python.test/src/runner.py run test_int.py::test_int_from_unicode_whitespace '--subprocess-args=--experimental-options=true --python.EnableDebuggingBuiltins' --append-path=/workspace/graalpython/lib-python/3
Collected 1 tests
graalpython/com.oracle.graal.python.test/src/tests/test_int.py::test_int_from_unicode_whitespace ... ERROR (0.10s)

======================================================================
ERROR: graalpython/com.oracle.graal.python.test/src/tests/test_int.py::test_int_from_unicode_whitespace
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/workspace/graalpython/com.oracle.graal.python.test/src/tests/test_int.py", line 456, in test_int_from_unicode_whitespace
    assert int("\xa0123") == 123
           ~~~^^^^^^^^^^^
ValueError: invalid literal for int() with base 10: '\xa0123'

Ran 1 tests in 0.13s

FAILED (errors=1)
Command '/workspace/mxbuild/linux-amd64/GRAALPY_JVM_STANDALONE/bin/graalpy --vm.ea --python.WithJavaStacktrace=1 --experimental-options=true --python.EnableDebuggingBuiltins /workspace/graalpython/com.oracle.graal.python.test/src/runner.py run test_int.py::test_int_from_unicode_whitespace '--subprocess-args=--experimental-options=true --python.EnableDebuggingBuiltins' --append-path=/workspace/graalpython/lib-python/3' returned non-zero exit status 1.
EXIT=1

After (fix + nearby int tests)

========== AFTER FIX: new test + nearby int tests ==========
WARNING:   graalpython:PYTHON_NATIVE_STANDALONE_SVM_JAVA25:
distribution PYTHON_NATIVE_STANDALONE_SVM_JAVA25 redefined
Running: MX_GRAALPYTEST=1 PYTHONHASHSEED=0 /workspace/mxbuild/linux-amd64/GRAALPY_JVM_STANDALONE/bin/graalpy --vm.ea --python.WithJavaStacktrace=1 --experimental-options=true --python.EnableDebuggingBuiltins /workspace/graalpython/com.oracle.graal.python.test/src/runner.py run test_int.py::test_int_from_unicode_whitespace '--subprocess-args=--experimental-options=true --python.EnableDebuggingBuiltins' --append-path=/workspace/graalpython/lib-python/3
Collected 1 tests
graalpython/com.oracle.graal.python.test/src/tests/test_int.py::test_int_from_unicode_whitespace ... ok (0.00s)

Ran 1 tests in 0.02s

OK (passed=1)
NEW_TEST_EXIT=0
WARNING:   graalpython:PYTHON_NATIVE_STANDALONE_SVM_JAVA25:
distribution PYTHON_NATIVE_STANDALONE_SVM_JAVA25 redefined
Running: MX_GRAALPYTEST=1 PYTHONHASHSEED=0 /workspace/mxbuild/linux-amd64/GRAALPY_JVM_STANDALONE/bin/graalpy --vm.ea --python.WithJavaStacktrace=1 --experimental-options=true --python.EnableDebuggingBuiltins /workspace/graalpython/com.oracle.graal.python.test/src/runner.py run test_int.py::test_create_int_from_string '--subprocess-args=--experimental-options=true --python.EnableDebuggingBuiltins' --append-path=/workspace/graalpython/lib-python/3
Collected 1 tests
graalpython/com.oracle.graal.python.test/src/tests/test_int.py::test_create_int_from_string ... ok (0.00s)

Ran 1 tests in 0.02s

OK (passed=1)
NEARBY_TEST_EXIT=0
WARNING:   graalpython:PYTHON_NATIVE_STANDALONE_SVM_JAVA25:
distribution PYTHON_NATIVE_STANDALONE_SVM_JAVA25 redefined
Running: MX_GRAALPYTEST=1 PYTHONHASHSEED=0 /workspace/mxbuild/linux-amd64/GRAALPY_JVM_STANDALONE/bin/graalpy --vm.ea --python.WithJavaStacktrace=1 --experimental-options=true --python.EnableDebuggingBuiltins /workspace/graalpython/com.oracle.graal.python.test/src/runner.py run test_int.py::test_create_int_from_float '--subprocess-args=--experimental-options=true --python.EnableDebuggingBuiltins' --append-path=/workspace/graalpython/lib-python/3
Collected 1 tests
graalpython/com.oracle.graal.python.test/src/tests/test_int.py::test_create_int_from_float ... ok (0.00s)

Ran 1 tests in 0.02s

OK (passed=1)
NEARBY2_EXIT=0
WARNING:   graalpython:PYTHON_NATIVE_STANDALONE_SVM_JAVA25:
distribution PYTHON_NATIVE_STANDALONE_SVM_JAVA25 redefined
Running: MX_GRAALPYTEST=1 PYTHONHASHSEED=0 /workspace/mxbuild/linux-amd64/GRAALPY_JVM_STANDALONE/bin/graalpy --vm.ea --python.WithJavaStacktrace=1 --experimental-options=true --python.EnableDebuggingBuiltins /workspace/graalpython/com.oracle.graal.python.test/src/runner.py run test_int.py::test_int '--subprocess-args=--experimental-options=true --python.EnableDebuggingBuiltins' --append-path=/workspace/graalpython/lib-python/3
Collected 1 tests
graalpython/com.oracle.graal.python.test/src/tests/test_int.py::test_int ... ok (0.00s)

Ran 1 tests in 0.03s

OK (passed=1)
TEST_INT_EXIT=0

This change was prepared with AI assistance. I remain responsible for the contribution and have reviewed it.

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