Use ICU4j for isidentifier

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/str/StringUtils.java

@@ -362,40 +362,14 @@ public static boolean isIdentifier(String value) {
             return false;
         }
         int c = value.codePointAt(pos);
-        int type = Character.getType(c);
-        if (c != '_') {
-            // Unicode XID_Start
-            switch (type) {
-                case Character.UPPERCASE_LETTER:
-                case Character.LOWERCASE_LETTER:
-                case Character.TITLECASE_LETTER:
-                case Character.MODIFIER_LETTER:
-                case Character.OTHER_LETTER:
-                case Character.LETTER_NUMBER:
-                    break;
-                default:
-                    return false;
-            }
+        if (c != '_' && !UCharacter.hasBinaryProperty(c, UProperty.XID_START)) {
+            return false;
         }
         pos += Character.charCount(c);
         while (pos < value.length()) {
             c = value.codePointAt(pos);
-            type = Character.getType(c);
-            // Unicode XID_Continue
-            switch (type) {
-                case Character.UPPERCASE_LETTER:
-                case Character.LOWERCASE_LETTER:
-                case Character.TITLECASE_LETTER:
-                case Character.MODIFIER_LETTER:
-                case Character.OTHER_LETTER:
-                case Character.LETTER_NUMBER:
-                case Character.NON_SPACING_MARK:
-                case Character.COMBINING_SPACING_MARK:
-                case Character.DECIMAL_DIGIT_NUMBER:
-                case Character.CONNECTOR_PUNCTUATION:
-                    break;
-                default:
-                    return false;
+            if (!UCharacter.hasBinaryProperty(c, UProperty.XID_CONTINUE)) {
+                return false;
             }
             pos += Character.charCount(c);
         }