Revert fbf2424838:

postpone "transparent semantics for spread operator"
until Java-related design issues are resolved (java.utils.Arrays#asList).

compiler/backend/src/org/jetbrains/kotlin/codegen/ExpressionCodegen.java

@@ -2683,24 +2683,14 @@ public class ExpressionCodegen extends JetVisitor<StackValue, StackValue> implem
         }
 
         if (hasSpread) {
-            boolean arrayOfReferences = KotlinBuiltIns.isArray(outType);
             if (size == 1) {
-                // Arrays.copyOf(array, newLength)
-                ValueArgument argument = arguments.get(0);
-                Type arrayType = arrayOfReferences ? Type.getType("[Ljava/lang/Object;")
-                                                   : Type.getType("[" + elementType.getDescriptor());
-                gen(argument.getArgumentExpression(), type);
-                v.dup();
-                v.arraylength();
-                v.invokestatic("java/util/Arrays", "copyOf", Type.getMethodDescriptor(arrayType, arrayType, Type.INT_TYPE), false);
-                if (arrayOfReferences) {
-                    v.checkcast(type);
-                }
+                gen(arguments.get(0).getArgumentExpression(), type);
             }
             else {
                 String owner;
                 String addDescriptor;
                 String toArrayDescriptor;
+                boolean arrayOfReferences = KotlinBuiltIns.isArray(outType);
                 if (arrayOfReferences) {
                     owner = "kotlin/jvm/internal/SpreadBuilder";
                     addDescriptor = "(Ljava/lang/Object;)V";

compiler/testData/codegen/boxWithStdlib/vararg/spreadCopiesArray.kt

@@ -1,27 +0,0 @@
-import kotlin.test.*
-
-fun <T> copyArray(vararg data: T): Array<out T> = data
-
-inline fun <reified T> reifiedCopyArray(vararg data: T): Array<out T> = data
-
-fun copyIntArray(vararg data: Int): IntArray = data
-
-fun box(): String {
-    val sarr = arrayOf("OK")
-    val sarr2 = copyArray(*sarr)
-    sarr[0] = "Array was not copied"
-    assertEquals(sarr2[0], "OK", "Failed: Array<String>")
-
-    var rsarr = arrayOf("OK")
-    var rsarr2 = reifiedCopyArray(*rsarr)
-    rsarr[0] = "Array was not copied"
-    assertEquals(rsarr2[0], "OK", "Failed: Array<String>, reified copy")
-
-    val iarr = IntArray(1)
-    iarr[0] = 1
-    val iarr2 = copyIntArray(*iarr)
-    iarr[0] = 42
-    assertEquals(iarr2[0], 1, "Failed: IntArray")
-
-    return "OK"
-}

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

@@ -91,8 +91,7 @@ public class VarArgTest extends CodegenTestCase {
         Method main = generateFunction("test");
         String[] args = {"mama", "papa"};
         String[] result = (String []) main.invoke(null, new Object[] {args});
-        assertTrue(args != result);
-        assertTrue(Arrays.equals(args, result));
+        assertTrue(args == result);
     }
 
     public void testArrayAsVararg2() throws InvocationTargetException, IllegalAccessException {

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

@@ -4591,12 +4591,6 @@ 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");