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

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

@@ -0,0 +1,19 @@
+// FILE: KotlinFile.kt
+
+interface C : A, B
+
+fun foo(c: C) {
+    c.setSomething(c.getSomething() + 1)
+    c.something++
+}
+
+// FILE: A.java
+public interface A {
+    int getSomething();
+}
+
+// FILE: B.java
+public interface B {
+    int getSomething();
+    void setSomething(int value);
+}