PSI2IR: SAM conversion in varargs

compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargsMixed.kt

@@ -0,0 +1,12 @@
+// !LANGUAGE: +NewInference +FunctionalInterfaceConversion +SamConversionPerArgument
+fun interface MyRunnable {
+    fun run()
+}
+
+fun test(a: Any, r: MyRunnable) {
+    if (a is MyRunnable) {
+        foo({}, r, a)
+    }
+}
+
+fun foo(vararg rs: MyRunnable) {}