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

compiler/testData/diagnostics/testsWithStdLib/experimental/experimentalIsNotEnabled.fir.kt

@@ -0,0 +1,23 @@
+// FILE: api.kt
+
+@Experimental
+annotation class Marker
+
+@Marker
+fun f() {}
+
+// FILE: usage.kt
+
+fun use1() {
+    f()
+}
+
+@Marker
+fun use2() {
+    f()
+}
+
+@UseExperimental(Marker::class)
+fun use3() {
+    f()
+}