Fix failing tests

compiler/testData/ir/irText/expressions/kt36963.fir.txt

@@ -1,9 +0,0 @@
-FILE fqName:<root> fileName:/kt36963.kt
-  FUN name:foo visibility:public modality:FINAL <> () returnType:kotlin.Unit
-    BLOCK_BODY
-  FUN name:test visibility:public modality:FINAL <> () returnType:kotlin.reflect.KFunction0<kotlin.Unit>
-    BLOCK_BODY
-      RETURN type=kotlin.Nothing from='public final fun test (): kotlin.reflect.KFunction0<kotlin.Unit> declared in <root>'
-        CALL 'public final fun CHECK_NOT_NULL <T0> (arg0: T0 of kotlin.internal.ir.CHECK_NOT_NULL?): T0 of kotlin.internal.ir.CHECK_NOT_NULL declared in kotlin.internal.ir' type=kotlin.reflect.KFunction0<kotlin.Unit> origin=EXCLEXCL
-          <T0>: kotlin.reflect.KFunction0<kotlin.Unit>
-          arg0: FUNCTION_REFERENCE 'public final fun foo (): kotlin.Unit declared in <root>' type=kotlin.reflect.KFunction0<kotlin.Unit> origin=null reflectionTarget=<same>

compiler/testData/ir/irText/expressions/kt36963.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 fun foo() {}
 
 fun test() = (::foo)!!

compiler/testData/ir/irText/expressions/kt36963.kt.txt

@@ -1,7 +1,7 @@
 fun foo() {
 }
 
-fun test(): ErrorType {
+fun test(): KFunction0<Unit> {
   return CHECK_NOT_NULL<KFunction0<Unit>>(arg0 = ::foo)
 }