Support move on depth 2

compiler/backend/src/org/jetbrains/jet/codegen/StackValue.java

@@ -413,10 +413,16 @@ public abstract class StackValue {
                 put(type, v);
             }
             else if (depth == 1) {
-                if (this.type.getSize() != 1) {
+                int size = this.type.getSize();
+                if (size == 1) {
+                    v.swap();
+                } else if (size == 2) {
+                    v.dupX2();
+                    v.pop();
+                } else {
                     throw new UnsupportedOperationException("don't know how to move type " + type + " to top of stack");
                 }
-                v.swap();
+
                 coerceTo(type, v);
             }
             else {

compiler/testData/codegen/box/safeCall/safeCallOnLong.kt

@@ -0,0 +1,6 @@
+fun f(b : Long.(Long)->Long) = 1L?.b(2L)
+
+fun box(): String {
+    val x = f { this + it }
+    return if (x == 3L) "OK" else "fail $x"
+}

compiler/tests/org/jetbrains/jet/codegen/generated/BlackBoxCodegenTestGenerated.java

@@ -5808,6 +5808,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest(fileName);
         }
         
+        @TestMetadata("safeCallOnLong.kt")
+        public void testSafeCallOnLong() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/safeCall/safeCallOnLong.kt");
+            doTest(fileName);
+        }
+        
         @TestMetadata("staticCall.kt")
         public void testStaticCall() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/safeCall/staticCall.kt");