KT-4340: Jvm backend generates invalid synthetic accessor for private extension property

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

@@ -1024,9 +1024,15 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
                     InstructionAdapter iv = codegen.v;
                     boolean forceField = AsmUtil.isPropertyWithBackingFieldInOuterClass(original) && !isClassObject(bridge.getContainingDeclaration());
                     StackValue property = codegen.intermediateValueForProperty(original, forceField, null, MethodKind.SYNTHETIC_ACCESSOR);
-                    if (!forceField) {
-                        iv.load(0, OBJECT_TYPE);
+
+                    Type[] argTypes = signature.getAsmMethod().getArgumentTypes();
+                    for (int i = 0, reg = 0; i < argTypes.length; i++) {
+                        Type argType = argTypes[i];
+                        iv.load(reg, argType);
+                        //noinspection AssignmentToForLoopParameter
+                        reg += argType.getSize();
                     }
+
                     property.put(property.type, iv);
                     iv.areturn(signature.getReturnType());
                 }

compiler/testData/codegen/box/properties/kt4340.kt

@@ -0,0 +1,36 @@
+class A {
+
+    var result: Int = 0;
+
+    private val Int.times3: Int
+        get() = this * 3
+
+    private var Int.times: Int
+        get() = this * 4
+        set(s: Int) {
+            result = this * s
+        }
+
+    fun test(p: Int):Int {
+        return {
+            p.times3
+        }()
+    }
+
+    fun test2(p: Int, s: Int):Int {
+        {
+            p.times = s
+        }()
+        return result
+    }
+}
+
+fun box() : String {
+    var result = A().test(3);
+    if (result != 9) return "fail1: $result"
+
+    result = A().test2(2, 4);
+    if (result != 8) return "fail2: $result"
+
+    return "OK"
+}

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

@@ -4689,6 +4689,11 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest("compiler/testData/codegen/box/properties/kt4252_2.kt");
         }
         
+        @TestMetadata("kt4340.kt")
+        public void testKt4340() throws Exception {
+            doTest("compiler/testData/codegen/box/properties/kt4340.kt");
+        }
+        
         @TestMetadata("kt4373.kt")
         public void testKt4373() throws Exception {
             doTest("compiler/testData/codegen/box/properties/kt4373.kt");