Iniital implementation of synthetic extensions for SAM-adapter functions (non-static only)

compiler/testData/diagnostics/tests/syntheticExtensions/javaProperties/KotlinOverridesJava2.kt

@@ -0,0 +1,25 @@
+// FILE: KotlinFile.kt
+abstract class KotlinClass : JavaInterface1, JavaInterface2 {
+    override fun getSomething(): String = ""
+}
+
+fun foo(k: KotlinClass) {
+    useString(k.getSomething())
+    useString(k.something)
+    if (<!SENSELESS_COMPARISON!>k.something == null<!>) return
+
+    k.setSomething(1)
+    <!VAL_REASSIGNMENT!>k.something<!> = <!CONSTANT_EXPECTED_TYPE_MISMATCH!>1<!>
+}
+
+fun useString(<!UNUSED_PARAMETER!>i<!>: String) {}
+
+// FILE: JavaInterface1.java
+public interface JavaInterface1 {
+    String getSomething();
+}
+
+// FILE: JavaInterface2.java
+public interface JavaInterface2 {
+    void setSomething(int value);
+}