[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/regressions/kt201.fir.kt

@@ -0,0 +1,8 @@
+// KT-201 Allow to call extension with nullable receiver with a '.'
+
+fun <T : Any> T?.npe() : T = if (this == null) throw NullPointerException() else this
+
+fun foo() {
+  val i : Int? = 1
+  i.npe() // error!
+}