Support for synthetic extensions in codegen

compiler/testData/codegen/boxAgainstJava/syntheticExtensions/getter.java

@@ -0,0 +1,3 @@
+class JavaClass {
+    public String getOk() { return "OK"; }
+}

compiler/testData/codegen/boxAgainstJava/syntheticExtensions/getter.kt

@@ -0,0 +1,3 @@
+fun box(): String {
+    return JavaClass().ok
+}

compiler/testData/codegen/boxAgainstJava/syntheticExtensions/implicitReceiver.java

@@ -0,0 +1,11 @@
+class JavaClass {
+    private String myX;
+
+    public String getX() {
+        return myX;
+    }
+
+    public void setX(String x) {
+        myX = x;
+    }
+}

compiler/testData/codegen/boxAgainstJava/syntheticExtensions/implicitReceiver.kt

@@ -0,0 +1,8 @@
+fun box(): String {
+    return JavaClass().doIt()
+}
+
+fun JavaClass.doIt(): String {
+    x = "OK"
+    return x
+}

compiler/testData/codegen/boxAgainstJava/syntheticExtensions/plusPlus.java

@@ -0,0 +1,11 @@
+class JavaClass {
+    private int myX = 0;
+
+    public int getX() {
+        return myX;
+    }
+
+    public void setX(int x) {
+        myX = x;
+    }
+}

compiler/testData/codegen/boxAgainstJava/syntheticExtensions/plusPlus.kt

@@ -0,0 +1,5 @@
+fun box(): String {
+    val javaClass = JavaClass()
+    javaClass.x++
+    return if (javaClass.x == 1) "OK" else "ERROR"
+}

compiler/testData/codegen/boxAgainstJava/syntheticExtensions/setter.java

@@ -0,0 +1,11 @@
+class JavaClass {
+    private String myX;
+
+    public String getX() {
+        return myX;
+    }
+
+    public void setX(String x) {
+        myX = x;
+    }
+}

compiler/testData/codegen/boxAgainstJava/syntheticExtensions/setter.kt

@@ -0,0 +1,5 @@
+fun box(): String {
+    val javaClass = JavaClass()
+    javaClass.x = "OK"
+    return javaClass.x
+}