Fix JVM_GetClassFileVersion

For primitive we need to return the latest class version for the current
context java version.

Author: gilles-duboscq

espresso/src/com.oracle.truffle.espresso/src/com/oracle/truffle/espresso/vm/VM.java

@@ -96,7 +96,6 @@
 import com.oracle.truffle.espresso.classfile.ConstantPool;
 import com.oracle.truffle.espresso.classfile.Constants;
 import com.oracle.truffle.espresso.classfile.JavaKind;
-import com.oracle.truffle.espresso.classfile.JavaVersion;
 import com.oracle.truffle.espresso.classfile.ParserKlass;
 import com.oracle.truffle.espresso.classfile.attributes.Attribute;
 import com.oracle.truffle.espresso.classfile.attributes.EnclosingMethodAttribute;
@@ -1410,7 +1409,7 @@ public int JVM_GetClassFileVersion(@JavaType(Class.class) StaticObject clazz, @I
         profiler.profile(2);
         // For primitives, return latest (Same as HotSpot).
         // We do the same for arrays. HotSpot just crashes in that case.
-        return JavaVersion.LATEST_SUPPORTED_CLASSFILE;
+        return getJavaVersion().classFileVersion();
     }
 
     @VmImpl(isJni = true)