[classlib][luni]some non ascii characters in String2Test

[Tony Wu]

I found following line in java.lang.String2Test.java

LINE464:  "string".getBytes("?Q?D??_??_6ffa?+vG?_??���??");

I converted it to "?Q?D??_??_6ffa?+vG?_??\u951f\ufffd??" by
native2ascii and all tests passed, but I'm not sure if this fix is ok
since the "?" may indicate some unrecognized character in my locale?
What's your opinion?

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Tony Wu
China Software Development Lab, IBM