[FIR Completion] Enable passing tests

idea/idea-completion/testData/basic/common/InClassPropertyAccessor.kt

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 class Test(val testParam : Int) {
   val x : Int get() {
       val test = 12

idea/idea-completion/testData/basic/common/InfixCallNoSpecialLambdaArgumentItem.kt

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 // checks that no special item "ext1 { String, Int -> ... }" created for infix call
 infix fun Int.ext1(handler: (String, Int) -> Unit){}
 infix fun Int.ext2(c: Char){}