FIR: support adapted callable reference with vararg

compiler/testData/diagnostics/tests/callableReference/genericCallWithReferenceAgainstVararg.fir.kt

@@ -7,7 +7,7 @@ fun test(i: IntArray) {
     myLet(::foo)
     <!INAPPLICABLE_CANDIDATE!>myLet<!><Int>(<!UNRESOLVED_REFERENCE!>::foo<!>)
     myLet<IntArray>(::foo)
-    <!INAPPLICABLE_CANDIDATE!>myLetExplicit1<!>(<!UNRESOLVED_REFERENCE!>::foo<!>)
+    myLetExplicit1(::foo)
     myLetExplicit2(::foo)
 }
 

compiler/testData/diagnostics/tests/callableReference/referenceAdaptationCompatibility.fir.kt

@@ -36,7 +36,7 @@ object Test3 {
 
         fun test() {
             val result = foo(::bar)
-            <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int")!>result<!>
+            <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.String")!>result<!>
         }
     }
 }

compiler/testData/diagnostics/tests/callableReference/referenceAdaptationHasDependencyOnApi14.fir.kt

@@ -12,7 +12,7 @@ fun allOfTheAbove(f: (A) -> Unit): Any = f
 
 fun test() {
     coercionToUnit(A::foo)
-    <!INAPPLICABLE_CANDIDATE!>varargToElement<!>(<!UNRESOLVED_REFERENCE!>A::foo<!>)
+    varargToElement(A::foo)
     defaultAndVararg(A::foo)
     allOfTheAbove(A::foo)
 }

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

@@ -6,5 +6,5 @@ fun foo(i: Int) {}
 
 val fn1: (Int) -> Unit = ::foo
 val fn2: (IntArray) -> Unit = ::foo
-val fn3: (Int, Int) -> Unit = <!UNRESOLVED_REFERENCE!>::foo<!>
+val fn3: (Int, Int) -> Unit = ::foo
 val fn4: (Array<String>) -> Unit = ::foo