Properties declared in primary constructors should have proper accessors in IR.

compiler/testData/ir/irText/classes/initVal.txt

@@ -8,6 +8,11 @@ FILE /initVal.kt
       FIELD public final val x: kotlin.Int
         EXPRESSION_BODY
           GET_VAR 'value-parameter x: Int' type=kotlin.Int operator=INITIALIZE_PROPERTY_FROM_PARAMETER
+      FUN public final fun <get-x>(): kotlin.Int
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='<get-x>(): Int'
+            GET_BACKING_FIELD 'x: Int' type=kotlin.Int operator=null
+              receiver: THIS of 'TestInitValFromParameter' type=TestInitValFromParameter
   CLASS CLASS TestInitValInClass
     CONSTRUCTOR public constructor TestInitValInClass()
       BLOCK_BODY