FIR: Improve rendering for type operators

compiler/fir/psi2fir/testData/rawBuilder/declarations/genericFunctions.txt

@@ -2,7 +2,7 @@ FILE: genericFunctions.kt
     public? final? interface Any {
     }
     <reified T : Any> public? final? inline fun Any.safeAs(): T? {
-        ^safeAs as?/T(this#)
+        ^safeAs (this# as? T)
     }
     public? abstract class Summator {
         public? constructor(): super<kotlin/Any>()

compiler/fir/psi2fir/testData/rawBuilder/expressions/branches.txt

@@ -52,7 +52,7 @@ FILE: branches.kt
             in($subj$, rangeTo#(Int(1), Int(2))) ->  {
                 String(Fail)
             }
-            is/Number($subj$) ->  {
+            ($subj$ is Number) ->  {
                 String(Number)
             }
             else ->  {

compiler/fir/psi2fir/testData/rawBuilder/expressions/modifications.txt

@@ -11,6 +11,6 @@ FILE: modifications.kt
         this# += String(Omega)
     }
     public? final? fun Any.modify(): kotlin/Unit {
-        lval <complex-set>: <implicit> = as/List<Int>(this#)
+        lval <complex-set>: <implicit> = (this# as List<Int>)
         <complex-set># += Int(42)
     }

compiler/fir/psi2fir/testData/rawBuilder/expressions/typeOperators.txt

@@ -2,14 +2,14 @@ FILE: typeOperators.kt
     public? final? interface IThing {
     }
     public? final? fun test1(x: Any): <implicit> {
-        ^test1 is/IThing(x#)
+        ^test1 (x# is IThing)
     }
     public? final? fun test2(x: Any): <implicit> {
-        ^test2 !is/IThing(x#)
+        ^test2 (x# !is IThing)
     }
     public? final? fun test3(x: Any): <implicit> {
-        ^test3 as/IThing(x#)
+        ^test3 (x# as IThing)
     }
     public? final? fun test4(x: Any): <implicit> {
-        ^test4 as?/IThing(x#)
+        ^test4 (x# as? IThing)
     }

compiler/fir/resolve/testData/resolve/builtins/lists.txt

@@ -8,8 +8,8 @@ FILE: lists.kt
 
     }
     public final fun R|kotlin/collections/List<kotlin/String>|.convert(): R|MyStringList| {
-        ^convert as/R|MyStringList|(this#)
+        ^convert (this# as R|MyStringList|)
     }
     public final fun ret(l: R|kotlin/collections/MutableList<kotlin/String>|): R|MyMutableStringList| {
-        ^ret as/R|MyMutableStringList|(this#)
+        ^ret (this# as R|MyMutableStringList|)
     }

compiler/fir/resolve/testData/resolve/genericFunctions.txt

@@ -2,7 +2,7 @@ FILE: genericFunctions.kt
     public abstract interface Any {
     }
     <reified T : R|Any|> public final inline fun R|Any|.safeAs(): R|T|? {
-        ^safeAs as?/R|T|(this#)
+        ^safeAs (this# as? R|T|)
     }
     public abstract class Summator {
         public constructor(): super<R|kotlin/Any|>()

compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt

@@ -607,6 +607,16 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
         print(")")
     }
 
+    override fun visitTypeOperatorCall(typeOperatorCall: FirTypeOperatorCall) {
+        print("(")
+        typeOperatorCall.argument.accept(this)
+        print(" ")
+        print(typeOperatorCall.operation.operator)
+        print(" ")
+        typeOperatorCall.typeRef.accept(this)
+        print(")")
+    }
+
     override fun visitAnnotationCall(annotationCall: FirAnnotationCall) {
         print("@")
         annotationCall.useSiteTarget?.let {