Spread should always copy arrays.

compiler/tests/org/jetbrains/kotlin/codegen/VarArgTest.java

@@ -21,6 +21,7 @@ import org.jetbrains.kotlin.test.ConfigurationKind;
 import java.lang.reflect.Array;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
+import java.util.Arrays;
 
 public class VarArgTest extends CodegenTestCase {
     @Override
@@ -89,7 +90,9 @@ public class VarArgTest extends CodegenTestCase {
         loadText("private fun asList(vararg elems: String) = elems; fun test(ts: Array<String>) = asList(*ts); ");
         Method main = generateFunction("test");
         String[] args = {"mama", "papa"};
-        assertTrue(args == main.invoke(null, new Object[]{ args } ));
+        String[] result = (String []) main.invoke(null, new Object[] {args});
+        assertTrue(args != result);
+        assertTrue(Arrays.equals(args, result));
     }
 
     public void testArrayAsVararg2() throws InvocationTargetException, IllegalAccessException {

compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxWithStdlibCodegenTestGenerated.java

@@ -4591,6 +4591,12 @@ public class BlackBoxWithStdlibCodegenTestGenerated extends AbstractBlackBoxCode
             JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/boxWithStdlib/vararg"), Pattern.compile("^(.+)\\.kt$"), true);
         }
 
+        @TestMetadata("spreadCopiesArray.kt")
+        public void testSpreadCopiesArray() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/boxWithStdlib/vararg/spreadCopiesArray.kt");
+            doTestWithStdlib(fileName);
+        }
+
         @TestMetadata("varargInFunParam.kt")
         public void testVarargInFunParam() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/boxWithStdlib/vararg/varargInFunParam.kt");