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

compiler/testData/diagnostics/tests/callableReference/resolve/withVararg.fir.kt

@@ -0,0 +1,10 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+fun foo(vararg ii: Int) {}
+fun foo(vararg ss: String) {}
+fun foo(i: Int) {}
+
+val fn1: (Int) -> Unit = ::foo
+val fn2: (IntArray) -> Unit = ::foo
+val fn3: (Int, Int) -> Unit = <!UNRESOLVED_REFERENCE!>::foo<!>
+val fn4: (Array<String>) -> Unit = ::foo