[IR] update testdata: better support for IrCall

compiler/testData/ir/irText/classes/delegatedImplementation.kt.txt

@@ -106,7 +106,7 @@ class Test1 : IBase {
   }
 
   override fun String.qux() {
-    #$$delegate_0.qux($receiver = <this>)
+    (#$$delegate_0, <this>).qux()
   }
 
 
@@ -131,13 +131,13 @@ class Test2 : IBase, IOther {
   }
 
   override fun String.qux() {
-    #$$delegate_0.qux($receiver = <this>)
+    (#$$delegate_0, <this>).qux()
   }
 
   private /*final field*/ val $$delegate_1: IOther = otherImpl(x0 = "", y0 = 42)
   override val Byte.z1: Int
     override get(): Int {
-      return #$$delegate_1.<get-z1>($receiver = <this>)
+      return (#$$delegate_1, <this>).<get-z1>()
     }
 
   override val x: String
@@ -147,10 +147,10 @@ class Test2 : IBase, IOther {
 
   override var Byte.z2: Int
     override get(): Int {
-      return #$$delegate_1.<get-z2>($receiver = <this>)
+      return (#$$delegate_1, <this>).<get-z2>()
     }
     override set(<set-?>: Int) {
-      #$$delegate_1.<set-z2>($receiver = <this>, <set-?> = <set-?>)
+      (#$$delegate_1, <this>).<set-z2>(<set-?> = <set-?>)
     }
 
   override var y: Int