[GR-47378] Compare bytes as unsigned bytes

Author: ppisl

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/bytes/BytesNodes.java

@@ -966,7 +966,7 @@ protected boolean doCmp(byte[] selfArray, int selfLength, byte[] otherArray, int
                 return shortcutLengthResult();
             }
             for (int i = 0; i < Math.min(selfLength, otherLength); i++) {
-                compareResult = Byte.compare(selfArray[i], otherArray[i]);
+                compareResult = Integer.compare(Byte.toUnsignedInt(selfArray[i]), Byte.toUnsignedInt(otherArray[i]));
                 if (compareResult != 0) {
                     break;
                 }