zero-shark ldc bugfix

[Andrew Zhogin]

Hi.

I found problem with shark code generation for ldc* opcodes.

Crash example (launch with -Xcomp):

import java.text.*;
import java.util.Locale;
import java.util.Currency;
import sun.util.LocaleServiceProviderPool;
import java.util.spi.CurrencyNameProvider;

public class test {

    public static void main(String[] args) {

        LocaleServiceProviderPool.getPool(CurrencyNameProvider.class);
    }
}

In SharkConstant constructor: already mirrored unloaded-class object
is not expected and is_loaded is set to true.
Java-mirror object for klass is not "is_klass", just an object.

Here is patch in attachment.

-- 
Best regards, Andrew Zhogin.
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