Supported SAM adapters as get/set operators.

compiler/testData/codegen/boxWithJava/samAdapters/operators/multiGetSet.kt

@@ -0,0 +1,13 @@
+fun box(): String {
+    val obj = JavaClass()
+
+    var v1 = "FAIL"
+    obj[{ v1 = "O" }, { v1 += "K" }]
+    if (v1 != "OK") return "get: $v1"
+
+    var v2 = "FAIL"
+    obj[{ v2 = "" }, { v2 += "O" }] = { v2 += "K" }
+    if (v2 != "OK") return "set: $v2"
+
+    return "OK"
+}