Make the unicode equality test an external function rather than in-lining it.

The real benefit of the unicode specialized function comes from
bypassing the overhead of PyObject_RichCompareBool() and not
from being in-lined (especially since there was almost no shared
data between the caller and callee).  Also, the in-lining was
having a negative effect on code generation for the callee.

Objects/unicodeobject.c

@@ -42,6 +42,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include "Python.h"
 #include "ucnhash.h"
 #include "bytes_methods.h"
+#include "stringlib/eq.h"
 
 #ifdef MS_WINDOWS
 #include <windows.h>
@@ -10886,6 +10887,12 @@ PyUnicode_RichCompare(PyObject *left, PyObject *right, int op)
     return v;
 }
 
+int
+_PyUnicode_EQ(PyObject *aa, PyObject *bb)
+{
+    return unicode_eq(aa, bb);
+}
+
 int
 PyUnicode_Contains(PyObject *container, PyObject *element)
 {